diff --git a/.proofline/criteria/ac-0022.md b/.proofline/criteria/ac-0022.md
index 54d5f67..d08ea22 100644
--- a/.proofline/criteria/ac-0022.md
+++ b/.proofline/criteria/ac-0022.md
@@ -7,9 +7,9 @@ status: active
 
 ## Criterion
 
-`trex.slots.req.<instance>`의 **전략용 slots 응답에 포함되는** `holding` 슬롯(AC-0023에 따라 C-case 수량 불일치로 제외된 slot 제외)의 `qty`는 요청한 instance에 결합된 KIS account broker holdings(`hldg_qty`)를 authoritative source로 사용해야 한다. `daily_slot.qty`와 portfolio-hub 집계값은 각각 `slot_quantity`, `asset_quantity` 진단 필드로 분리 유지한다. broker 수량을 확보하지 못했거나 freshness 허용시간을 초과하면 core/hub mirror fallback 없이 `qty=null`, `qty_source="unavailable"`, `broker_quantity_available=false`, `broker_quantity_captured_at=null`을 반환해 전략이 fail-closed하도록 해야 한다. confirmed broker zero는 `qty=0`, `qty_source="broker"`로 unavailable과 구분되어야 한다. 이 read path는 주문 submit/cancel, ledger write, slot lifecycle mutation을 유발하지 않아야 한다.
+`trex.slots.req.<instance>`의 **전략용 slots 응답에 포함되는** `holding` 슬롯(AC-0023에 따라 B 또는 C reconcile warning으로 제외된 slot 제외)의 `qty`는 요청한 instance에 결합된 KIS account broker holdings(`hldg_qty`)를 authoritative source로 사용해야 한다. `daily_slot.qty`와 portfolio-hub 집계값은 각각 `slot_quantity`, `asset_quantity` 진단 필드로 분리 유지한다. broker 수량을 확보하지 못했거나 freshness 허용시간을 초과하면 core/hub mirror fallback 없이 `qty=null`, `qty_source="unavailable"`, `broker_quantity_available=false`, `broker_quantity_captured_at=null`을 반환해 전략이 fail-closed하도록 해야 한다. confirmed broker zero는 `qty=0`, `qty_source="broker"`로 unavailable과 구분되어야 한다. 이 read path는 주문 submit/cancel, ledger write, slot lifecycle mutation을 유발하지 않아야 한다.
 
-**Scope note:** AC-0023에 따라 C-case(`case_code=C`) 수량 불일치로 전략용 slots RPC에서 제외된 slot에는 이 AC의 broker-authoritative `qty` 응답 형식을 적용하지 않는다. AC-0023 제외가 AC-0022 broker-qty 형식보다 우선한다.
+**Scope note:** AC-0023에 따라 B 또는 C reconcile warning(`case_code=B` 또는 `case_code=C`)으로 전략용 slots RPC에서 제외된 slot에는 이 AC의 broker-authoritative `qty` 응답 형식을 적용하지 않는다. AC-0023 제외가 AC-0022 broker-qty 형식보다 우선한다.
 
 ## Verification
 
diff --git a/.proofline/criteria/ac-0023.md b/.proofline/criteria/ac-0023.md
index e0e01d7..1ab13c4 100644
--- a/.proofline/criteria/ac-0023.md
+++ b/.proofline/criteria/ac-0023.md
@@ -3,23 +3,25 @@ id: "ac-0023"
 status: active
 ---
 
-# C-case quantity mismatch — strategy RPC exclusion and intent blocking
+# B/C reconcile warning — strategy RPC exclusion and intent blocking
 
 ## Criterion
 
-KIS 계좌 잔고(`hldg_qty`)와 같은 instance가 관리하는 동일 symbol의 portfolio-hub `asset_quantity` 합계가 일치하지 않으면(`case_code=C` reconcile-warning 활성), 해당 symbol의 모든 `holding` slot을 `trex.slots.req.<instance>` 응답에서 제외해야 한다. 수량 대조는 **instance_key + symbol 단위 합계**로 수행하며, 개별 portfolio 수량을 KIS 종목 합계와 직접 비교해서는 안 된다. 응답에는 `excluded_slots.reconcile_quantity_mismatch` 필드로 제외된 slot 수를 포함한다. warn-store를 읽지 못하면 경고 유무를 모르는 상태로 slot 목록을 반환하지 않고 `degraded=true` / `reason="warn_store_unavailable"`으로 응답해야 한다(fail-closed). 신규 buy/sell intent는 durable warning을 재확인하여 `reconcile_warned` 사유로 거부한다. C-case 경고 해제는 symbol 단위 합계가 다시 일치한 경우에만 수행하며, 해당 symbol에 걸린 모든 C-case 경고를 함께 해제한다. 이 경로는 주문 submit/cancel, ledger write, slot lifecycle mutation을 유발하지 않아야 한다.
+`case_code=B`(core slot↔KIS 수량 불일치) 또는 `case_code=C`(portfolio-hub↔KIS 수량 불일치) reconcile-warning이 활성인 `holding` slot은 `trex.slots.req.<instance>` 응답에서 제외해야 한다. 동일 slot의 B/C 원인은 서로 덮어쓰지 않고 동시에 보존하며, 응답에는 제외된 slot 수와 활성 case별 count를 포함한다. 신규 buy/sell intent는 같은 durable warning 원인 집합을 재확인하여 `reconcile_warned` 사유로 거부한다. warn-store를 읽지 못하거나 warning metadata가 비어 있거나 지원하지 않는 case를 포함하면 안전한 eligibility를 입증할 수 없으므로 slots RPC는 `degraded=true` / `reason="warn_store_unavailable"`, intent는 `reconcile_warning_unavailable`(조회 실패) 또는 `reconcile_warned`(empty/unsupported metadata)로 fail-closed 처리해야 한다. `sync`는 수량 일치 확인 후 B-case만 해제하고, `verify`는 instance+symbol 단위 KIS와 portfolio-hub 합계가 다시 일치한 경우 C-case만 해제하여 다른 활성 원인을 보존한다. C-case 수량 대조는 **instance_key + symbol 단위 합계**로 수행하며, 개별 portfolio 수량을 KIS 종목 합계와 직접 비교해서는 안 된다. 이 경로는 주문 submit/cancel, ledger write, slot lifecycle mutation을 유발하지 않아야 한다.
 
 ## Verification
 
 - 성공 조건: KIS 440주, hub portfolio A 200주 + B 240주(합계 440) → A·B 모두 반환되고 `excluded_slots.reconcile_quantity_mismatch=0`.
-- 불일치 조건: KIS 440주, hub A 200주 + B 235주(합계 435) → A·B 모두 제외되고 `excluded_slots.reconcile_quantity_mismatch=2`. 다른 symbol 정상 slot은 같은 응답에 포함된다.
+- 불일치 조건: KIS 440주, hub A 200주 + B 235주(합계 435) → A·B 모두 제외되고 `excluded_slots.reconcile_quantity_mismatch=2`, `active_reconcile_warning_cases.C=2`. 다른 symbol 정상 slot은 같은 응답에 포함된다.
+- 복합 원인: 동일 slot에 B와 C가 동시에 활성일 때 두 원인이 모두 조회·차단되며, B 또는 C 하나를 해제해도 다른 원인은 보존된다.
+- B-case: B warning이 활성인 holding slot은 slots RPC에서 제외되고 신규 buy/sell intent도 거부된다.
 - 단일 portfolio 불일치: hub 단일 portfolio qty != KIS → 해당 symbol 전체 slot 제외.
-- fail-closed (slots RPC): warn-store가 `list_c_case_warned()` 중 예외를 throw하면 `slots=[], degraded=true, reason="warn_store_unavailable"` 반환.
+- fail-closed (slots RPC): warn-store 조회가 실패하거나 empty/unknown case metadata를 반환하면 `slots=[], degraded=true, reason="warn_store_unavailable"` 반환.
 - fail-closed (intent): intent 처리 시 `warn_store.is_warned()` 호출이 실패하면 `reconcile_warning_unavailable` 사유로 거부해야 한다 — fail-open 허용 불가.
-- intent race: 마지막 slots RPC 이후 경고가 설정된 경우에도 intent 처리 시점의 durable warning을 재확인해 `reconcile_warned`로 거부.
+- intent race: 마지막 slots RPC 이후 경고가 설정된 경우에도 intent 처리 시점의 durable warning을 재확인해 `reconcile_warned`로 거부. unknown case도 거래 허용 근거로 사용하지 않는다.
 - 해제: symbol 합계가 다시 일치하면 해당 symbol의 모든 **C-case 경고만** 함께 해제. 같은 symbol의 B-case 등 다른 case 경고는 보존해야 한다.
 - 해제 대상: HOLDING 뿐 아니라 모든 상태의 slot에 걸린 C-case 경고를 포함한다.
 - 해제 실패: 해제 도중 예외가 발생하면 `result='clear_failed'`를 반환하고 완전 성공으로 보고하지 않아야 한다(부분 성공 = 실패).
 - 시간이 지났다는 이유만으로 자동 해제하지 않음.
 - 비침습 조건: slots RPC 호출 전후로 slot 상태 전이, broker mutation, ledger write side effect가 없어야 한다.
-- AC-0022 우선순위: C-case로 제외된 slot에는 broker-authoritative `qty` 응답 형식(AC-0022)을 적용하지 않는다.
+- AC-0022 우선순위: B 또는 C reconcile warning으로 제외된 slot에는 broker-authoritative `qty` 응답 형식(AC-0022)을 적용하지 않는다.
diff --git a/docs/interface-contract.md b/docs/interface-contract.md
index 05b00df..7f020b2 100644
--- a/docs/interface-contract.md
+++ b/docs/interface-contract.md
@@ -110,13 +110,20 @@
         "last_seen": "ISO-8601 | null"
       },
       "paused": "bool",
+      "reconcile_warned": "bool",         // durable B/C warning 또는 unknown case 존재
+      "reconcile_warning_cases": ["B", "C"], // 활성 case code 목록
+      "trade_eligible": "bool",            // known blocking/unknown case가 없을 때만 true
       "strategy_name": "str | null",     // REQ-116 additive (BAT-055) — portfolio-hub PortfolioItem 출처
       "strategy_params": "dict",         // REQ-116 additive (BAT-055) — portfolio-hub opaque dict; {} if absent
       "markets": ["str"]                 // REQ-116 additive (BAT-055) — portfolio-hub markets list; [] if absent
     }
   ],
+  "excluded_slots": {
+    "reconcile_quantity_mismatch": "int",
+    "active_reconcile_warning_cases": {"B": "int", "C": "int"}
+  },
   "degraded": "bool",
-  "reason": "portfolio_hub_unavailable | snapshot_fetch_failed | cash_position_stale | null",
+  "reason": "portfolio_hub_unavailable | snapshot_fetch_failed | cash_position_stale | warn_store_unavailable | null",
   "message": "str | null"              // sanitized — no credentials/raw exceptions
 }
 ```
@@ -138,11 +145,14 @@
 | `warned` | 파생 | `slot_quantity != asset_quantity` (REQ-074 AC-2) |
 | `watchdog` | WatchdogStore | 만료 여부 + last_seen; null=store 미연결 |
 | `paused` | PauseStore | durable pause overlay (REQ-032) |
+| `reconcile_warned`, `reconcile_warning_cases` | ReconcileWarningStore | 동일 slot의 durable B/C 원인을 동시에 보존·노출 |
+| `trade_eligible` | 파생(safety gate) | 활성 B/C 또는 지원하지 않는 warning case가 있으면 false |
 | `strategy_name` | hub (PortfolioItem via SnapshotStore) | REQ-116 additive. portfolio-hub 정본. hub 미제공 시 null |
 | `strategy_params` | hub (PortfolioItem via SnapshotStore) | REQ-116 additive. opaque dict; hub 미제공 시 {} |
 | `markets` | hub (PortfolioItem via SnapshotStore) | REQ-116 additive. list[str]; hub 미제공 시 [] |
 
 - **slot-origin strategy 필드 없음** (REQ-074 AC-5, REQ-116 additive 재도입 후에도 유지): `strategy_id`, `sell_strategy_id`, `active_strategy_id` 는 응답에 포함되지 않는다. `strategy_name`/`strategy_params`/`markets` 는 PortfolioItem(hub) 출처이므로 AC-5 제외 대상과 구분된다 — REQ-116 Notes 참조.
+- **Reconcile warning fail-closed**: B/C warning이 활성인 holding slot은 응답에서 제외된다. warning store 조회 실패, empty metadata, unknown case는 `slots=[]`, `degraded=true`, `reason="warn_store_unavailable"`로 처리한다. intent admission도 동일 durable source를 재확인하며 unknown case를 거래 허용 근거로 사용하지 않는다.
 - **Breaking change (holding `qty`) rollout**: 기존 전략 클라이언트가 `qty=slot mirror`로 가정했다면 `slot_quantity`를 읽도록 전환해야 한다. 권장 경로는 (1) 클라이언트에 `qty_source`/`broker_quantity_available` 체크 추가 → (2) fail-closed (`qty is null`) 처리 배포 → (3) `qty`를 broker 정본으로 사용하도록 cutover 순서다.
 - `spy=false`(기본): holding 슬롯 응답 후 `WatchdogStore.update(slot_id)` 호출 — 전략 폴링 = 생존 신호.
 - `spy=true`: watchdog 갱신 건너뜀 — 운영자 CLI(`universe`/`slots`) 가 항상 사용.
diff --git a/tests/adapters/portfolio/test_reconcile_warning_store.py b/tests/adapters/portfolio/test_reconcile_warning_store.py
new file mode 100644
index 0000000..05cc113
--- /dev/null
+++ b/tests/adapters/portfolio/test_reconcile_warning_store.py
@@ -0,0 +1,42 @@
+"""PostgreSQLReconcileWarningStore integration tests."""
+from __future__ import annotations
+
+from trex_core.adapters.portfolio.reconcile_warning_store import (
+    PostgreSQLReconcileWarningStore,
+)
+
+
+def test_warning_store_preserves_multiple_cases_for_same_slot(pg_clean):
+    store = PostgreSQLReconcileWarningStore(pg_clean)
+    store.set_warned("slot-1", portfolio_id="pf-A", case_code="B", reason="b")
+    store.set_warned("slot-1", portfolio_id="pf-A", case_code="C", reason="c")
+
+    assert store.is_warned("slot-1") is True
+    info = store.get_warning_info("slot-1")
+    assert info is not None
+    assert info["case_codes"] == ["B", "C"]
+
+
+def test_warning_store_case_specific_clear_and_full_clear(pg_clean):
+    store = PostgreSQLReconcileWarningStore(pg_clean)
+    store.set_warned("slot-2", portfolio_id="pf-A", case_code="B")
+    store.set_warned("slot-2", portfolio_id="pf-A", case_code="C")
+
+    store.clear_warned("slot-2", case_code="C")
+    info = store.get_warning_info("slot-2")
+    assert info is not None
+    assert info["case_codes"] == ["B"]
+
+    store.clear_warned("slot-2")
+    assert store.is_warned("slot-2") is False
+
+
+def test_warning_store_is_durable_across_reinstantiation(pg_clean):
+    a = PostgreSQLReconcileWarningStore(pg_clean)
+    a.set_warned("slot-restart", portfolio_id="pf-A", case_code="B")
+    a.set_warned("slot-restart", portfolio_id="pf-A", case_code="C")
+
+    b = PostgreSQLReconcileWarningStore(pg_clean)
+    info = b.get_warning_info("slot-restart")
+    assert info is not None
+    assert info["case_codes"] == ["B", "C"]
diff --git a/tests/application/test_reconcile_notification.py b/tests/application/test_reconcile_notification.py
index 1c1de0d..b95044d 100644
--- a/tests/application/test_reconcile_notification.py
+++ b/tests/application/test_reconcile_notification.py
@@ -896,7 +896,7 @@ def test_b_sync_does_not_publish_resolved_when_clear_warned_fails():
     from trex_core.application.reconciliation import sync_slot_to_broker
 
     class FailingWarnStore(InMemoryReconcileWarningStore):
-        def clear_warned(self, slot_id):
+        def clear_warned(self, slot_id, *, case_code=None):
             raise RuntimeError("DB unavailable")
 
     ns = InMemoryReconcileNotificationStore()
diff --git a/tests/application/test_reconcile_warning_blocking.py b/tests/application/test_reconcile_warning_blocking.py
index 73487b7..ed9f761 100644
--- a/tests/application/test_reconcile_warning_blocking.py
+++ b/tests/application/test_reconcile_warning_blocking.py
@@ -340,6 +340,52 @@ def test_intent_service_sell_rejected_when_reconcile_warned():
     assert d.reason == "reconcile_warned"
 
 
+def test_unknown_warning_case_blocks_buy_and_sell_intents():
+    repo = InMemorySlotRepository()
+    svc = SlotService(repo)
+    warn_store = InMemoryReconcileWarningStore()
+    slot = _make_holding_slot(repo, svc, qty=10)
+    warn_store.set_warned(str(slot.slot_id), portfolio_id="pf-A", case_code="X")
+
+    intent_svc = IntentService(
+        svc,
+        repo,
+        InMemoryIntentStore(),
+        instance_key="default",
+        warn_store=warn_store,
+    )
+
+    buy = intent_svc.submit_buy(BuyIntent(
+        intent_id="b-unknown-case",
+        slot_id=slot.slot_id,
+        entry_price=100.0,
+        qty=1.0,
+    ))
+    sell = intent_svc.submit_sell(SellIntent(
+        intent_id="s-unknown-case",
+        slot_id=slot.slot_id,
+        reason="strategy_exit",
+    ))
+
+    assert buy.status == "rejected"
+    assert buy.reason == "reconcile_warned"
+    assert sell.status == "rejected"
+    assert sell.reason == "reconcile_warned"
+
+
+def test_slot_to_dict_marks_unknown_warning_case_ineligible():
+    repo = InMemorySlotRepository()
+    svc = SlotService(repo)
+    warn_store = InMemoryReconcileWarningStore()
+    slot = _make_holding_slot(repo, svc, qty=10)
+    warn_store.set_warned(str(slot.slot_id), portfolio_id="pf-A", case_code="X")
+
+    row = slot_to_dict(slot, warn_store=warn_store)
+
+    assert row["reconcile_warning_cases"] == ["X"]
+    assert row["trade_eligible"] is False
+
+
 def test_reconcile_warned_buy_emits_alarm_with_allowlisted_fields_after_finalize():
     repo = InMemorySlotRepository()
     svc = SlotService(repo)
@@ -892,6 +938,8 @@ def test_slot_to_dict_reconcile_warned_false_when_no_warn_store():
     row = slot_to_dict(slot, warn_store=None)
     assert "reconcile_warned" in row
     assert row["reconcile_warned"] is False
+    assert row["trade_eligible"] is True
+    assert row["reconcile_warning_cases"] == []
 
 
 def test_slot_to_dict_reconcile_warned_true_when_warned():
@@ -902,6 +950,8 @@ def test_slot_to_dict_reconcile_warned_true_when_warned():
     warn_store.set_warned(str(slot.slot_id), portfolio_id="pf-A", case_code="B")
     row = slot_to_dict(slot, warn_store=warn_store)
     assert row["reconcile_warned"] is True
+    assert row["trade_eligible"] is False
+    assert row["reconcile_warning_cases"] == ["B"]
 
 
 def test_slot_to_dict_paused_and_warned_independent():
diff --git a/tests/application/test_reconcile_warning_store.py b/tests/application/test_reconcile_warning_store.py
index 97f329e..7224aa9 100644
--- a/tests/application/test_reconcile_warning_store.py
+++ b/tests/application/test_reconcile_warning_store.py
@@ -33,14 +33,27 @@ def test_clear_warned_returns_false():
     assert store.is_warned("slot-1") is False
 
 
-# AC-3 (REQ-102): duplicate set_warned on same slot_id => upsert (single entry).
-def test_set_warned_upsert_same_slot():
+# AC-3 (REQ-123): same slot can carry multiple active warning causes.
+def test_set_warned_preserves_multiple_cases_on_same_slot():
     store = _store()
     store.set_warned("slot-1", portfolio_id="pf-A", case_code="B", reason="first")
     store.set_warned("slot-1", portfolio_id="pf-A", case_code="C", reason="second")
-    # After second set, is_warned still True — single entry (no duplicate row).
     assert store.is_warned("slot-1") is True
     assert store.list_warned() == {"slot-1"}
+    info = store.get_warning_info("slot-1")
+    assert info is not None
+    assert info["case_codes"] == ["B", "C"]
+
+
+def test_clear_warned_single_case_preserves_other_case():
+    store = _store()
+    store.set_warned("slot-1", portfolio_id="pf-A", case_code="B")
+    store.set_warned("slot-1", portfolio_id="pf-A", case_code="C")
+    store.clear_warned("slot-1", case_code="C")
+    info = store.get_warning_info("slot-1")
+    assert info is not None
+    assert info["case_codes"] == ["B"]
+    assert store.is_warned("slot-1") is True
 
 
 # AC-5 (REQ-102): list_warned returns set of warned slot_ids.
diff --git a/tests/application/test_slots_handler_quantity_mismatch.py b/tests/application/test_slots_handler_quantity_mismatch.py
index 124a495..333574b 100644
--- a/tests/application/test_slots_handler_quantity_mismatch.py
+++ b/tests/application/test_slots_handler_quantity_mismatch.py
@@ -128,6 +128,44 @@ def test_ac1_single_portfolio_c_case_excluded():
 
     assert resp.payload["slots"] == []
     assert resp.payload["excluded_slots"]["reconcile_quantity_mismatch"] == 1
+    assert resp.payload["excluded_slots"]["active_reconcile_warning_cases"] == {"C": 1}
+
+
+def test_holding_slot_with_b_case_is_excluded_for_strategy():
+    repo = InMemorySlotRepository()
+    svc = SlotService(repo)
+    warn_store = InMemoryReconcileWarningStore()
+
+    slot = _make_holding_slot(repo, svc, portfolio_id="pf-A", symbol=SYM_A, qty=10)
+    warn_store.set_warned(str(slot.slot_id), portfolio_id="pf-A", case_code="B")
+
+    handler = _make_handler(repo, warn_store)
+    resp = handler(_req(filter="holding"))
+
+    assert resp.payload["slots"] == []
+    assert resp.payload["excluded_slots"]["reconcile_quantity_mismatch"] == 1
+    assert resp.payload["excluded_slots"]["active_reconcile_warning_cases"] == {"B": 1}
+
+
+def test_holding_slot_with_b_and_c_cases_keeps_both_and_reports_both():
+    repo = InMemorySlotRepository()
+    svc = SlotService(repo)
+    warn_store = InMemoryReconcileWarningStore()
+
+    slot = _make_holding_slot(repo, svc, portfolio_id="pf-A", symbol=SYM_A, qty=10)
+    slot_id = str(slot.slot_id)
+    warn_store.set_warned(slot_id, portfolio_id="pf-A", case_code="B")
+    warn_store.set_warned(slot_id, portfolio_id="pf-A", case_code="C")
+
+    handler = _make_handler(repo, warn_store)
+    resp = handler(_req(filter="holding"))
+
+    assert resp.payload["slots"] == []
+    assert resp.payload["excluded_slots"]["reconcile_quantity_mismatch"] == 1
+    assert resp.payload["excluded_slots"]["active_reconcile_warning_cases"] == {"B": 1, "C": 1}
+    info = warn_store.get_warning_info(slot_id)
+    assert info is not None
+    assert info["case_codes"] == ["B", "C"]
 
 
 # ---------------------------------------------------------------------------
@@ -286,7 +324,8 @@ def test_ac5_excluded_slots_count_zero_when_no_warnings():
     resp = handler(_req(filter="holding"))
 
     assert "excluded_slots" in resp.payload
-    assert resp.payload["excluded_slots"] == {"reconcile_quantity_mismatch": 0}
+    assert resp.payload["excluded_slots"]["reconcile_quantity_mismatch"] == 0
+    assert resp.payload["excluded_slots"]["active_reconcile_warning_cases"] == {}
 
 
 # ---------------------------------------------------------------------------
@@ -312,8 +351,8 @@ def test_ac6_no_warn_store_no_filtering_no_excluded_slots_key():
 # ---------------------------------------------------------------------------
 
 class BrokenWarnStore(InMemoryReconcileWarningStore):
-    """Simulates a warn_store that fails on list_c_case_warned."""
-    def list_c_case_warned(self):
+    """Simulates a warn_store that fails on warning reads."""
+    def list_warned(self):
         raise RuntimeError("db connection lost")
 
 
@@ -332,6 +371,24 @@ def test_ac7_warn_store_failure_fail_closed():
     assert "excluded_slots" in resp.payload
 
 
+def test_unknown_warning_case_fails_closed():
+    repo = InMemorySlotRepository()
+    svc = SlotService(repo)
+    warn_store = InMemoryReconcileWarningStore()
+    slot = _make_holding_slot(repo, svc, portfolio_id="pf-A", symbol=SYM_A, qty=10)
+    warn_store.set_warned(str(slot.slot_id), portfolio_id="pf-A", case_code="X")
+
+    resp = _make_handler(repo, warn_store)(_req())
+
+    assert resp.payload["slots"] == []
+    assert resp.payload["degraded"] is True
+    assert resp.payload["reason"] == "warn_store_unavailable"
+    assert resp.payload["excluded_slots"] == {
+        "reconcile_quantity_mismatch": 0,
+        "active_reconcile_warning_cases": {},
+    }
+
+
 def test_ac23_exclusion_precedes_broker_and_strategy_state_readers():
     repo = InMemorySlotRepository()
     svc = SlotService(repo)
@@ -356,7 +413,7 @@ def test_ac23_exclusion_precedes_broker_and_strategy_state_readers():
     )
     response = handler(_req(filter="holding")).payload
     assert response["slots"] == []
-    assert response["excluded_slots"] == {"reconcile_quantity_mismatch": 1}
+    assert response["excluded_slots"]["reconcile_quantity_mismatch"] == 1
 
 
 # ---------------------------------------------------------------------------
diff --git a/tests/application/test_sync.py b/tests/application/test_sync.py
index c09d08f..4079789 100644
--- a/tests/application/test_sync.py
+++ b/tests/application/test_sync.py
@@ -199,6 +199,22 @@ def test_sync_holding_qty_mismatch_updated():
     assert not ws_out.is_warned(str(slot.slot_id))
 
 
+def test_sync_clears_only_b_case_when_slot_has_multiple_warning_causes():
+    slot = _make_slot(SlotState.HOLDING, qty=5.0)
+    ws = InMemoryReconcileWarningStore()
+    slot_id = str(slot.slot_id)
+    ws.set_warned(slot_id, portfolio_id="pf-005930", case_code="B")
+    ws.set_warned(slot_id, portfolio_id="pf-005930", case_code="C")
+
+    result, _repo, ws_out = _setup(slot, {"005930": 10}, warn_store=ws)
+
+    assert result["warning_cleared"] is True
+    assert ws_out.is_warned(slot_id) is True
+    info = ws_out.get_warning_info(slot_id)
+    assert info is not None
+    assert info["case_codes"] == ["C"]
+
+
 # ---------------------------------------------------------------------------
 # AC-4: WAC seed from cost_basis_port when available
 # ---------------------------------------------------------------------------
diff --git a/tests/application/test_verify.py b/tests/application/test_verify.py
index 5adc88d..61f94cf 100644
--- a/tests/application/test_verify.py
+++ b/tests/application/test_verify.py
@@ -313,6 +313,40 @@ def test_verify_c_case_clear_preserves_b_case_warning():
     assert b_info is not None and b_info["case_code"] == "B"
 
 
+def test_verify_c_case_clear_on_slot_with_b_and_c_keeps_b():
+    sym = "005930"
+    slot = _make_slot(status=SlotState.HOLDING, symbol=sym, pid="pf-c")
+
+    repo = InMemorySlotRepository()
+    repo.add_slot(slot)
+
+    ws = InMemoryReconcileWarningStore()
+    slot_id = str(slot.slot_id)
+    ws.set_warned(slot_id, portfolio_id="pf-c", case_code="B")
+    ws.set_warned(slot_id, portfolio_id="pf-c", case_code="C")
+
+    store = SnapshotStore()
+    store.swap([
+        PortfolioItem(portfolio_id="pf-c", symbol=sym, cash_balance=0.0, asset_quantity=10.0),
+    ])
+    broker = FakeBroker({sym: 10})
+
+    result = verify_slot_reconcile(
+        portfolio_id="pf-c",
+        store=store,
+        broker=broker,
+        slot_repo=repo,
+        instance_key=INSTANCE,
+        warn_store=ws,
+    )
+
+    assert result["result"] == "cleared"
+    assert ws.is_warned(slot_id) is True
+    info = ws.get_warning_info(slot_id)
+    assert info is not None
+    assert info["case_codes"] == ["B"]
+
+
 def test_verify_c_case_clear_non_holding_slot():
     """A non-HOLDING slot with C-case warning for the same symbol must also be cleared."""
     sym = "005930"
@@ -360,11 +394,11 @@ class _FailAfterNStore(InMemoryReconcileWarningStore):
         self._calls = 0
         self._fail_after = fail_after
 
-    def clear_warned(self, slot_id: str) -> None:
+    def clear_warned(self, slot_id: str, *, case_code: str | None = None) -> None:
         self._calls += 1
         if self._calls > self._fail_after:
             raise RuntimeError("simulated DB error")
-        super().clear_warned(slot_id)
+        super().clear_warned(slot_id, case_code=case_code)
 
 
 def test_verify_partial_clear_failure_returns_clear_failed():
diff --git a/tests/runtime/test_cli_operator.py b/tests/runtime/test_cli_operator.py
index f110464..91f6d1e 100644
--- a/tests/runtime/test_cli_operator.py
+++ b/tests/runtime/test_cli_operator.py
@@ -418,7 +418,7 @@ def test_sync_fail_closed_skipped_error_exits_nonzero_without_writes(
             return SimpleNamespace(get_balance=lambda: []), None
 
     class _WarningStore:
-        def clear_warned(self, *_args):
+        def clear_warned(self, *_args, **_kwargs):
             raise AssertionError("warning clear must not be called")
 
     class _Connection:
diff --git a/trex_core/adapters/persistence/sql/016_create_slot_reconcile_warning.sql b/trex_core/adapters/persistence/sql/016_create_slot_reconcile_warning.sql
index e663962..98664c3 100644
--- a/trex_core/adapters/persistence/sql/016_create_slot_reconcile_warning.sql
+++ b/trex_core/adapters/persistence/sql/016_create_slot_reconcile_warning.sql
@@ -1,6 +1,6 @@
 -- BAT-050 / REQ-102: reconcile-warning durable store (dcy-034).
--- PK: slot_id (TEXT, UUID string). pause_store 동형 설계.
--- ON CONFLICT DO UPDATE: 동일 slot_id 재삽입 시 최신 값으로 갱신.
+-- Initial schema; migration 028 upgrades PK to (slot_id, case_code)
+-- so B/C causes can coexist for the same slot.
 CREATE TABLE IF NOT EXISTS slot_reconcile_warning (
     slot_id      TEXT        PRIMARY KEY,
     portfolio_id TEXT        NOT NULL,
diff --git a/trex_core/adapters/persistence/sql/028_preserve_reconcile_warning_cases.sql b/trex_core/adapters/persistence/sql/028_preserve_reconcile_warning_cases.sql
new file mode 100644
index 0000000..40771bf
--- /dev/null
+++ b/trex_core/adapters/persistence/sql/028_preserve_reconcile_warning_cases.sql
@@ -0,0 +1,30 @@
+-- REQ-123 / issue #83:
+-- Preserve simultaneous warning causes by keying warnings per (slot_id, case_code).
+-- NOTE: historical overwritten causes cannot be reconstructed from the prior
+-- slot_id-only schema; this migration enables forward preservation only.
+UPDATE slot_reconcile_warning
+SET case_code = 'B'
+WHERE case_code IS NULL OR case_code = '';
+
+ALTER TABLE slot_reconcile_warning
+    ALTER COLUMN case_code SET NOT NULL;
+
+DELETE FROM slot_reconcile_warning w
+USING (
+    SELECT ctid, ROW_NUMBER() OVER (
+        PARTITION BY slot_id, case_code
+        ORDER BY updated_at DESC, created_at DESC, ctid DESC
+    ) AS rn
+    FROM slot_reconcile_warning
+) ranked
+WHERE w.ctid = ranked.ctid
+  AND ranked.rn > 1;
+
+ALTER TABLE slot_reconcile_warning
+    DROP CONSTRAINT IF EXISTS slot_reconcile_warning_pkey;
+
+ALTER TABLE slot_reconcile_warning
+    ADD CONSTRAINT slot_reconcile_warning_pkey PRIMARY KEY (slot_id, case_code);
+
+CREATE INDEX IF NOT EXISTS idx_slot_reconcile_warning_slot_id
+    ON slot_reconcile_warning (slot_id);
diff --git a/trex_core/adapters/portfolio/reconcile_warning_store.py b/trex_core/adapters/portfolio/reconcile_warning_store.py
index 731b565..91f8c7a 100644
--- a/trex_core/adapters/portfolio/reconcile_warning_store.py
+++ b/trex_core/adapters/portfolio/reconcile_warning_store.py
@@ -1,8 +1,4 @@
-"""PostgreSQL-backed durable reconcile-warning store (REQ-102, BAT-050).
-
-pause_store.py와 동형 설계. PK: slot_id. case_code: 'B' | 'C'.
-Survives daemon restart (dcy-034 NFR-1).
-"""
+"""PostgreSQL-backed durable reconcile-warning store (REQ-102, BAT-050)."""
 from __future__ import annotations
 
 from datetime import datetime, timezone
@@ -12,7 +8,7 @@ from trex_core.adapters.persistence.postgresql import _require_psycopg
 
 
 class PostgreSQLReconcileWarningStore:
-    """`slot_reconcile_warning` table CRUD. slot_id PK is the gate (REQ-102)."""
+    """`slot_reconcile_warning` table CRUD keyed by (slot_id, case_code)."""
 
     def __init__(self, dsn: str, *, psycopg_module: Any = None) -> None:
         self._psycopg = _require_psycopg(psycopg_module)
@@ -34,9 +30,8 @@ class PostgreSQLReconcileWarningStore:
                     "INSERT INTO slot_reconcile_warning "
                     "(slot_id, portfolio_id, case_code, actor, reason, created_at, updated_at) "
                     "VALUES (%s, %s, %s, %s, %s, %s, %s) "
-                    "ON CONFLICT (slot_id) DO UPDATE "
+                    "ON CONFLICT (slot_id, case_code) DO UPDATE "
                     "SET portfolio_id = EXCLUDED.portfolio_id, "
-                    "    case_code    = EXCLUDED.case_code, "
                     "    actor        = EXCLUDED.actor, "
                     "    reason       = EXCLUDED.reason, "
                     "    updated_at   = EXCLUDED.updated_at",
@@ -44,13 +39,19 @@ class PostgreSQLReconcileWarningStore:
                 )
                 conn.commit()
 
-    def clear_warned(self, slot_id: str) -> None:
+    def clear_warned(self, slot_id: str, *, case_code: str | None = None) -> None:
         with self._psycopg.connect(self._dsn, autocommit=False) as conn:
             with conn.cursor() as cur:
-                cur.execute(
-                    "DELETE FROM slot_reconcile_warning WHERE slot_id = %s",
-                    (slot_id,),
-                )
+                if case_code is None:
+                    cur.execute(
+                        "DELETE FROM slot_reconcile_warning WHERE slot_id = %s",
+                        (slot_id,),
+                    )
+                else:
+                    cur.execute(
+                        "DELETE FROM slot_reconcile_warning WHERE slot_id = %s AND case_code = %s",
+                        (slot_id, case_code),
+                    )
                 conn.commit()
 
     def is_warned(self, slot_id: str) -> bool:
@@ -65,7 +66,7 @@ class PostgreSQLReconcileWarningStore:
     def list_warned(self) -> set[str]:
         with self._psycopg.connect(self._dsn) as conn:
             with conn.cursor() as cur:
-                cur.execute("SELECT slot_id FROM slot_reconcile_warning")
+                cur.execute("SELECT DISTINCT slot_id FROM slot_reconcile_warning")
                 return {row[0] for row in cur.fetchall()}
 
     def list_c_case_warned(self) -> set[str]:
@@ -73,26 +74,30 @@ class PostgreSQLReconcileWarningStore:
         with self._psycopg.connect(self._dsn) as conn:
             with conn.cursor() as cur:
                 cur.execute(
-                    "SELECT slot_id FROM slot_reconcile_warning WHERE case_code = %s",
+                    "SELECT DISTINCT slot_id FROM slot_reconcile_warning WHERE case_code = %s",
                     ("C",),
                 )
                 return {row[0] for row in cur.fetchall()}
 
     def get_warning_info(self, slot_id: str) -> dict | None:
-        """Return {"portfolio_id", "case_code", "actor", "reason"} or None (REQ-105/106)."""
+        """Return warning info with full active case set, or None."""
         with self._psycopg.connect(self._dsn) as conn:
             with conn.cursor() as cur:
                 cur.execute(
                     "SELECT portfolio_id, case_code, actor, reason "
-                    "FROM slot_reconcile_warning WHERE slot_id = %s LIMIT 1",
+                    "FROM slot_reconcile_warning WHERE slot_id = %s "
+                    "ORDER BY CASE WHEN case_code = 'C' THEN 0 ELSE 1 END, updated_at DESC",
                     (slot_id,),
                 )
-                row = cur.fetchone()
-                if row is None:
+                rows = cur.fetchall()
+                if not rows:
                     return None
+                case_codes = sorted({str(row[1]) for row in rows if row[1]})
+                preferred = rows[0]
                 return {
-                    "portfolio_id": row[0],
-                    "case_code": row[1],
-                    "actor": row[2],
-                    "reason": row[3],
+                    "portfolio_id": preferred[0],
+                    "case_code": preferred[1],
+                    "case_codes": case_codes,
+                    "actor": preferred[2],
+                    "reason": preferred[3],
                 }
diff --git a/trex_core/application/intents.py b/trex_core/application/intents.py
index 1f4bf2e..7297d06 100644
--- a/trex_core/application/intents.py
+++ b/trex_core/application/intents.py
@@ -29,6 +29,7 @@ from typing import Any, Callable, Optional
 from uuid import UUID
 
 from trex_core.application.alarm_emitter import AlarmEmitter
+from trex_core.application.portfolio import BLOCKING_RECONCILE_CASES
 from trex_core.application.ports import IntentStore
 from trex_core.domain.slot import (
     SlotAdmissionRejectedError,
@@ -270,6 +271,29 @@ class IntentService:
         except Exception:  # noqa: BLE001 - alarm path must not affect intent decision
             pass
 
+    def _is_reconcile_trade_blocked(self, slot_id: str) -> bool:
+        if self._warn_store is None:
+            return False
+        if not self._warn_store.is_warned(slot_id):
+            return False
+        info = self._warn_store.get_warning_info(slot_id)
+        if info is None:
+            return True
+        raw_codes = info.get("case_codes")
+        if isinstance(raw_codes, list):
+            case_codes = {str(code) for code in raw_codes if code}
+        else:
+            case_code = str(info.get("case_code", ""))
+            case_codes = {case_code} if case_code else set()
+        if not case_codes:
+            return True
+        # The warning row is authoritative. Unknown cases are not evidence
+        # that trading is safe: they may come from corrupt data or a newer
+        # producer that this core version cannot interpret.
+        if not case_codes.issubset(BLOCKING_RECONCILE_CASES):
+            return True
+        return bool(case_codes & BLOCKING_RECONCILE_CASES)
+
     # ------------------------------------------------------------
     def _dedup(self, intent_id: str, intent_type: str, payload: dict) -> Optional[IntentDecision]:
         """Return prior decision if intent_id already seen; else None (and reserve it)."""
@@ -339,7 +363,7 @@ class IntentService:
             # those paths call SlotService.sell() directly.
             if self._warn_store is not None:
                 try:
-                    if self._warn_store.is_warned(str(slot.slot_id)):
+                    if self._is_reconcile_trade_blocked(str(slot.slot_id)):
                         return IntentDecision(
                             intent.intent_id, "rejected", None, "reconcile_warned"
                         )
@@ -432,7 +456,7 @@ class IntentService:
         # SlotService.sell() / transit_slot() directly without IntentService (OQ-B).
         if self._warn_store is not None:
             try:
-                if self._warn_store.is_warned(str(slot.slot_id)):
+                if self._is_reconcile_trade_blocked(str(slot.slot_id)):
                     return IntentDecision(
                         intent.intent_id, "rejected", None, "reconcile_warned"
                     )
diff --git a/trex_core/application/messaging_handlers.py b/trex_core/application/messaging_handlers.py
index 9e5f291..f525d95 100644
--- a/trex_core/application/messaging_handlers.py
+++ b/trex_core/application/messaging_handlers.py
@@ -17,6 +17,7 @@ from trex_core.application.account_snapshot import AccountSnapshotUnavailable
 from trex_core.application.broker_port import BalanceItem
 from trex_core.application.messaging import RpcRequest, RpcResponse
 from trex_core.application.portfolio import (
+    BLOCKING_RECONCILE_CASES,
     PauseStore,
     ReconcileWarningStore,
     SnapshotStore,
@@ -263,28 +264,27 @@ def make_slots_rpc_handler(
             for s in holding_slots:
                 watchdog_store.update(str(s.slot_id))
 
-        # Build merged slot rows (REQ-074)
-        # BAT-050 / REQ-104: warn_store passed to slot_to_dict for reconcile_warned field.
-        slot_rows = [
-            slot_to_dict(
-                s,
-                snapshot_store=snapshot_store,
-                watchdog_store=watchdog_store,
-                pause_store=pause_store,
-                warn_store=warn_store,
-                watchdog_timeout_sec=watchdog_timeout_sec,
-            )
-            for s in slots
-        ]
-
-        # AC-0023 exclusion must precede all optional data readers so excluded
-        # slots cannot expose state or make an otherwise valid response fail.
-        excluded_count = 0
+        warning_cases_by_slot: dict[str, set[str]] = {}
         if warn_store is not None:
             try:
-                c_warned_ids = warn_store.list_c_case_warned()
+                warned_slot_ids = warn_store.list_warned()
+                for sid in warned_slot_ids:
+                    info = warn_store.get_warning_info(sid)
+                    if info is None:
+                        raise RuntimeError(f"missing warning info for slot_id={sid}")
+                    raw_codes = info.get("case_codes")
+                    if isinstance(raw_codes, list):
+                        codes = {str(code) for code in raw_codes if code}
+                    else:
+                        case_code = str(info.get("case_code", ""))
+                        codes = {case_code} if case_code else set()
+                    if not codes:
+                        raise RuntimeError(f"empty warning cases for slot_id={sid}")
+                    if not codes.issubset(BLOCKING_RECONCILE_CASES):
+                        raise RuntimeError(f"unsupported warning cases for slot_id={sid}")
+                    warning_cases_by_slot[str(sid)] = codes
             except Exception:  # noqa: BLE001
-                _log.exception("warn_store.list_c_case_warned() failed — fail-closed")
+                _log.exception("warn_store warning query failed — fail-closed")
                 return RpcResponse(payload={
                     "slots": [],
                     "available_slots": None,
@@ -294,20 +294,48 @@ def make_slots_rpc_handler(
                         "reconcile warning store unavailable; "
                         "returning no slots (fail-closed)"
                     ),
-                    "excluded_slots": {"reconcile_quantity_mismatch": 0},
+                    "excluded_slots": {
+                        "reconcile_quantity_mismatch": 0,
+                        "active_reconcile_warning_cases": {},
+                    },
                 })
-            if c_warned_ids:
-                included = [
-                    (slot, row)
-                    for slot, row in zip(slots, slot_rows, strict=True)
-                    if not (
-                        slot.status.value == "holding"
-                        and str(slot.slot_id) in c_warned_ids
-                    )
-                ]
-                excluded_count = len(slots) - len(included)
+
+        # Build merged slot rows (REQ-074)
+        slot_rows = [
+            slot_to_dict(
+                s,
+                snapshot_store=snapshot_store,
+                watchdog_store=watchdog_store,
+                pause_store=pause_store,
+                warning_cases_by_slot=warning_cases_by_slot,
+                watchdog_timeout_sec=watchdog_timeout_sec,
+            )
+            for s in slots
+        ]
+
+        # Exclusion must precede all optional data readers so blocked slots cannot
+        # expose state or make an otherwise valid response fail.
+        excluded_count = 0
+        excluded_case_counts: dict[str, int] = {}
+        if warn_store is not None:
+            included: list[tuple[object, dict]] = []
+            for slot, row in zip(slots, slot_rows, strict=True):
+                blocked_holding = (
+                    slot.status.value == "holding"
+                    and bool(set(row.get("reconcile_warning_cases", [])) & BLOCKING_RECONCILE_CASES)
+                )
+                if blocked_holding:
+                    excluded_count += 1
+                    for code in row.get("reconcile_warning_cases", []):
+                        excluded_case_counts[code] = excluded_case_counts.get(code, 0) + 1
+                    continue
+                included.append((slot, row))
+            if included:
                 slots = [slot for slot, _ in included]
                 slot_rows = [row for _, row in included]
+            else:
+                slots = []
+                slot_rows = []
 
         broker_qty_by_symbol: dict[str, int] = {}
         broker_qty_available = False
@@ -410,7 +438,10 @@ def make_slots_rpc_handler(
             "message": message,
         }
         if warn_store is not None:
-            base_payload["excluded_slots"] = {"reconcile_quantity_mismatch": excluded_count}
+            base_payload["excluded_slots"] = {
+                "reconcile_quantity_mismatch": excluded_count,
+                "active_reconcile_warning_cases": excluded_case_counts,
+            }
         return RpcResponse(payload=base_payload)
 
     return handler
diff --git a/trex_core/application/portfolio.py b/trex_core/application/portfolio.py
index abe519b..5e9e9ea 100644
--- a/trex_core/application/portfolio.py
+++ b/trex_core/application/portfolio.py
@@ -21,6 +21,8 @@ from datetime import UTC, datetime
 from enum import Enum
 from typing import Protocol
 
+BLOCKING_RECONCILE_CASES = frozenset({"B", "C"})
+
 # ---------------------------------------------------------------- portfolio-hub
 
 @dataclass(frozen=True)
@@ -359,7 +361,7 @@ class InMemoryKillSwitchStore:
 
 
 class ReconcileWarningStore(Protocol):
-    """Durable reconcile-warning overlay — slot_id PK (REQ-102, dcy-034)."""
+    """Durable reconcile-warning overlay keyed by (slot_id, case_code)."""
 
     def set_warned(
         self,
@@ -372,7 +374,7 @@ class ReconcileWarningStore(Protocol):
     ) -> None:
         ...
 
-    def clear_warned(self, slot_id: str) -> None:
+    def clear_warned(self, slot_id: str, *, case_code: str | None = None) -> None:
         ...
 
     def is_warned(self, slot_id: str) -> bool:
@@ -382,10 +384,14 @@ class ReconcileWarningStore(Protocol):
         ...
 
     def get_warning_info(self, slot_id: str) -> dict | None:
-        """Return {"portfolio_id", "case_code", "actor", "reason"} or None.
+        """Return warning info dict or None.
 
-        Used by verify to determine whether the warning is case_code='C'
-        (verify's responsibility) vs 'B' (sync's responsibility, REQ-106 OQ-C).
+        Returned dict includes:
+          {"portfolio_id", "case_code", "case_codes", "actor", "reason"}
+        where case_code is a backward-compatible preferred case and case_codes is
+        the full active case set for the slot.
+
+        Used by verify to determine whether C-case is active (REQ-106 OQ-C).
         Returns None when the slot has no active warning.
         """
         ...
@@ -403,8 +409,8 @@ class InMemoryReconcileWarningStore:
 
     def __init__(self) -> None:
         self._lock = threading.Lock()
-        # slot_id -> {"portfolio_id", "case_code", "actor", "reason"}
-        self._warned: dict[str, dict] = {}
+        # slot_id -> case_code -> {"portfolio_id", "actor", "reason"}
+        self._warned: dict[str, dict[str, dict]] = {}
 
     def set_warned(
         self,
@@ -416,16 +422,24 @@ class InMemoryReconcileWarningStore:
         reason: str = "",
     ) -> None:
         with self._lock:
-            self._warned[slot_id] = {
+            per_case = self._warned.setdefault(slot_id, {})
+            per_case[case_code] = {
                 "portfolio_id": portfolio_id,
-                "case_code": case_code,
                 "actor": actor,
                 "reason": reason,
             }
 
-    def clear_warned(self, slot_id: str) -> None:
+    def clear_warned(self, slot_id: str, *, case_code: str | None = None) -> None:
         with self._lock:
-            self._warned.pop(slot_id, None)
+            if case_code is None:
+                self._warned.pop(slot_id, None)
+                return
+            per_case = self._warned.get(slot_id)
+            if not per_case:
+                return
+            per_case.pop(case_code, None)
+            if not per_case:
+                self._warned.pop(slot_id, None)
 
     def is_warned(self, slot_id: str) -> bool:
         with self._lock:
@@ -437,12 +451,23 @@ class InMemoryReconcileWarningStore:
 
     def get_warning_info(self, slot_id: str) -> dict | None:
         with self._lock:
-            info = self._warned.get(slot_id)
-            return dict(info) if info is not None else None
+            per_case = self._warned.get(slot_id)
+            if not per_case:
+                return None
+            case_codes = sorted(per_case.keys())
+            preferred_case = "C" if "C" in per_case else case_codes[0]
+            preferred = per_case[preferred_case]
+            return {
+                "portfolio_id": preferred.get("portfolio_id", ""),
+                "case_code": preferred_case,
+                "case_codes": case_codes,
+                "actor": preferred.get("actor", ""),
+                "reason": preferred.get("reason", ""),
+            }
 
     def list_c_case_warned(self) -> set[str]:
         with self._lock:
-            return {sid for sid, info in self._warned.items() if info.get("case_code") == "C"}
+            return {sid for sid, per_case in self._warned.items() if "C" in per_case}
 
 
 class ReconcileNotificationStore(Protocol):
@@ -544,6 +569,7 @@ def slot_to_dict(
     watchdog_store=None,
     pause_store: PauseStore | None = None,
     warn_store: ReconcileWarningStore | None = None,
+    warning_cases_by_slot: dict[str, set[str]] | None = None,
     watchdog_timeout_sec: int = 120,
 ) -> dict:
     """Merged slot row for trex.slots.req (REQ-073/074).
@@ -618,10 +644,25 @@ def slot_to_dict(
     # BAT-050 / REQ-104: reconcile_warned overlay (ReconcileWarningStore) — additive field.
     # Bulk list_warned() called once per RPC (caller pre-fetches; see make_slots_rpc_handler).
     # warn_store=None → reconcile_warned=False (backward compatible, NFR-4).
-    reconcile_warned = False
-    if warn_store is not None:
-        reconcile_warned = str(s.slot_id) in warn_store.list_warned()
+    warning_cases: set[str] = set()
+    if warning_cases_by_slot is not None:
+        warning_cases = set(warning_cases_by_slot.get(str(s.slot_id), set()))
+    elif warn_store is not None:
+        info = warn_store.get_warning_info(str(s.slot_id))
+        if info is not None:
+            raw_cases = info.get("case_codes")
+            if isinstance(raw_cases, list):
+                warning_cases = {str(c) for c in raw_cases if c}
+            else:
+                case_code = str(info.get("case_code", ""))
+                if case_code:
+                    warning_cases = {case_code}
+    reconcile_warned = bool(warning_cases)
     d["reconcile_warned"] = reconcile_warned
+    d["reconcile_warning_cases"] = sorted(warning_cases)
+    known_blocking = bool(warning_cases & BLOCKING_RECONCILE_CASES)
+    unknown_cases = bool(warning_cases - BLOCKING_RECONCILE_CASES)
+    d["trade_eligible"] = not (known_blocking or unknown_cases)
 
     return d
 
@@ -637,4 +678,3 @@ def _sanitize(message: str) -> str:
             out = out[:idx] + "<redacted>"
             break
     return out[:200]
-
diff --git a/trex_core/application/reconciliation.py b/trex_core/application/reconciliation.py
index aca2c5d..bf326c1 100644
--- a/trex_core/application/reconciliation.py
+++ b/trex_core/application/reconciliation.py
@@ -629,7 +629,7 @@ def sync_slot_to_broker(
     Broker qty == 0 for slot   → skipped with WARN (slot-side A-case guard).
     Broker-only (no slot)      → NOT handled here; caller filters (FR-3).
 
-    After update, if slot.qty == broker_qty: clear_warned(slot_id).
+    After update, if slot.qty == broker_qty: clear_warned(slot_id, case_code="B").
     """
     from uuid import UUID
 
@@ -870,14 +870,15 @@ def sync_slot_to_broker(
     after_avg = float(refreshed.avg_price) if (refreshed and refreshed.avg_price is not None) else None
     after = {"qty": after_qty, "status": after_status, "avg_price": after_avg}
 
-    # Clear warning when qty now matches broker
+    # Clear B-case warning when qty now matches broker
     warning_cleared = False
     if after_qty is not None and int(after_qty) == broker_qty:
         try:
-            warn_store.clear_warned(slot_id)
+            warn_store.clear_warned(slot_id, case_code="B")
             warning_cleared = True
             _log.info(
-                "sync: reconcile-warning cleared slot=%s symbol=%s broker_qty=%d actor=sync",
+                "sync: reconcile-warning cleared slot=%s symbol=%s case_code=B "
+                "broker_qty=%d actor=sync",
                 slot_id, sym, broker_qty,
             )
         except Exception:  # noqa: BLE001
@@ -962,7 +963,7 @@ def verify_slot_reconcile(
             "reason": "no active reconcile-warning (already cleared or never set)",
         }
 
-    # Check case_code — verify is C-only (REQ-106 OQ-C).
+    # Check case set — verify is C-only (REQ-106 OQ-C).
     info = warn_store.get_warning_info(slot_id_str)
     if info is None:
         return {
@@ -974,8 +975,13 @@ def verify_slot_reconcile(
             "reason": "warning exists but get_warning_info returned None (unexpected)",
         }
 
-    case_code = info.get("case_code", "")
-    if case_code != "C":
+    case_codes_raw = info.get("case_codes")
+    if isinstance(case_codes_raw, list):
+        case_codes = {str(code) for code in case_codes_raw if code}
+    else:
+        case_code = str(info.get("case_code", ""))
+        case_codes = {case_code} if case_code else set()
+    if "C" not in case_codes:
         return {
             "portfolio_id": portfolio_id,
             "slot_id": slot_id_str,
@@ -983,7 +989,7 @@ def verify_slot_reconcile(
             "hub_qty": None,
             "broker_qty": None,
             "reason": (
-                f"warning case_code='{case_code}' is not 'C' — "
+                f"warning case_codes={sorted(case_codes)} do not include 'C' — "
                 "use 'trex-core sync' to resolve B-case (slot↔broker qty mismatch)"
             ),
         }
@@ -1014,9 +1020,17 @@ def verify_slot_reconcile(
                     continue
                 sid_str = str(s.slot_id)
                 warn_info = warn_store.get_warning_info(sid_str)
-                if warn_info is None or warn_info.get("case_code") != "C":
+                if warn_info is None:
                     continue
-                warn_store.clear_warned(sid_str)
+                warned_codes_raw = warn_info.get("case_codes")
+                if isinstance(warned_codes_raw, list):
+                    warned_codes = {str(code) for code in warned_codes_raw if code}
+                else:
+                    case_code = str(warn_info.get("case_code", ""))
+                    warned_codes = {case_code} if case_code else set()
+                if "C" not in warned_codes:
+                    continue
+                warn_store.clear_warned(sid_str, case_code="C")
                 store.set_warning(s.portfolio_id, False)
                 cleared_slots.append(sid_str)
             _log.info(
diff --git a/trex_core/runtime/cli.py b/trex_core/runtime/cli.py
index 128ef21..d985ad0 100644
--- a/trex_core/runtime/cli.py
+++ b/trex_core/runtime/cli.py
@@ -912,7 +912,15 @@ def _cmd_verify(args, cfg) -> int:
         c_slots: list[str] = []
         for sid in warn_store.list_warned():
             info = warn_store.get_warning_info(sid)
-            if info and info.get("case_code") == "C":
+            if not info:
+                continue
+            raw_codes = info.get("case_codes")
+            if isinstance(raw_codes, list):
+                case_codes = {str(code) for code in raw_codes if code}
+            else:
+                case_code = str(info.get("case_code", ""))
+                case_codes = {case_code} if case_code else set()
+            if "C" in case_codes:
                 c_slots.append(info.get("portfolio_id", ""))
         target_pids = [p for p in c_slots if p]
 
diff --git a/trex_core/runtime/daemon.py b/trex_core/runtime/daemon.py
index d232973..8af08bb 100644
--- a/trex_core/runtime/daemon.py
+++ b/trex_core/runtime/daemon.py
@@ -198,7 +198,7 @@ class Daemon:
         # BAT-010/011: per-slot watchdog (snapshot RPC writer, safety-sell reader).
         self.watchdog = WatchdogStore()
         self.pause_store = PostgreSQLPauseStore(config.dsn)
-        # BAT-050 / REQ-102: durable reconcile-warning store (slot_id PK).
+        # BAT-050 / REQ-102: durable reconcile-warning store ((slot_id, case_code) PK).
         self.warn_store = PostgreSQLReconcileWarningStore(config.dsn)
         # req-0007 / ac-0024: durable reconcile notification deduplication store.
         self.notification_store = PostgreSQLReconcileNotificationStore(config.dsn)