fix(expense): narrow travel route risk indicators

server/tests/test_expense_claim_platform_risk_stage.py

@@ -160,6 +160,52 @@ def _add_vague_goods_rule_asset(
     )
 
 
+def _add_multi_city_reason_rule_asset(
+    db: Session,
+    manager: AgentAssetRuleLibraryManager,
+) -> None:
+    rule_code = "risk.travel.medium.multi_city_no_reason"
+    file_name = f"{rule_code}.json"
+    payload = {
+        "schema_version": "2.0",
+        "rule_code": rule_code,
+        "name": "多城市行程缺少说明中风险",
+        "evaluator": "multi_city_reason_required",
+        "enabled": True,
+        "requires_attachment": True,
+        "applies_to": {
+            "domains": ["expense", "travel"],
+            "expense_types": ["travel"],
+            "business_stages": ["reimbursement"],
+        },
+        "outcomes": {"fail": {"severity": "medium", "action": "manual_review"}},
+    }
+    manager.write_rule_library_json(
+        library=RISK_RULES_LIBRARY,
+        file_name=file_name,
+        payload=payload,
+    )
+    db.add(
+        AgentAsset(
+            asset_type=AgentAssetType.RULE.value,
+            code=rule_code,
+            name="多城市行程缺少说明中风险",
+            description="",
+            domain=AgentAssetDomain.EXPENSE.value,
+            scenario_json=["差旅费"],
+            owner="pytest",
+            status=AgentAssetStatus.ACTIVE.value,
+            current_version="v1.0.0",
+            published_version="v1.0.0",
+            config_json={
+                "detail_mode": "json_risk",
+                "rule_library": RISK_RULES_LIBRARY,
+                "rule_document": {"file_name": file_name},
+            },
+        )
+    )
+
+
 def _write_attachment_meta(storage_root, invoice_id: str, meta: dict[str, Any]) -> None:
     file_path = storage_root / invoice_id
     file_path.parent.mkdir(parents=True, exist_ok=True)
@@ -520,3 +566,78 @@ def test_vague_ticket_content_still_flags_unclear_goods_name(
         assert len(rule_flags) == 1
         assert rule_flags[0]["severity"] == "low"
         assert rule_flags[0]["evidence"]["matched_keywords"] == ["服务费"]
+
+
+def test_multi_city_reason_risk_marks_only_abnormal_route_items(
+    tmp_path,
+    monkeypatch,
+) -> None:
+    with build_session() as db:
+        manager = AgentAssetRuleLibraryManager(rule_root=tmp_path / "rules")
+        storage_root = tmp_path / "attachments"
+        _patch_rule_manager(monkeypatch, manager)
+        monkeypatch.setattr(ExpenseClaimAttachmentStorage, "root", lambda self: storage_root)
+        _add_multi_city_reason_rule_asset(db, manager)
+
+        claim = _build_claim(claim_no="RE-MULTI-CITY-001", expense_type="travel")
+        claim.location = "上海"
+        claim.reason = "支撑国网仿生产环境部署"
+        routes = [
+            ("outbound", "武汉-上海", date(2026, 2, 20), Decimal("354.00")),
+            ("extra-out", "上海-深圳", date(2026, 2, 21), Decimal("438.00")),
+            ("extra-back", "深圳-上海", date(2026, 2, 22), Decimal("388.00")),
+            ("return", "上海-武汉", date(2026, 2, 23), Decimal("354.00")),
+        ]
+        claim.items = [
+            ExpenseClaimItem(
+                item_date=item_date,
+                item_type="train_ticket",
+                item_reason=route,
+                item_location=route,
+                item_amount=amount,
+                invoice_id=f"claim-multi-city/{suffix}.pdf",
+            )
+            for suffix, route, item_date, amount in routes
+        ]
+        db.add(claim)
+        db.commit()
+
+        for suffix, route, _, _ in routes:
+            _write_attachment_meta(
+                storage_root,
+                f"claim-multi-city/{suffix}.pdf",
+                {
+                    "document_info": {
+                        "document_type": "train_ticket",
+                        "document_type_label": "火车票",
+                        "scene_code": "travel",
+                        "scene_label": "交通票据",
+                        "fields": [
+                            {"key": "route", "label": "路线", "value": route},
+                        ],
+                    },
+                    "ocr_summary": f"火车票；{route}",
+                    "ocr_text": f"旅客行程为 {route}",
+                },
+            )
+
+        review = ExpenseClaimService(db).evaluate_platform_risk_rules(
+            claim,
+            business_stage="reimbursement",
+        )
+        rule_flags = [
+            flag
+            for flag in review["flags"]
+            if isinstance(flag, dict)
+            and flag.get("rule_code") == "risk.travel.medium.multi_city_no_reason"
+        ]
+
+        assert len(rule_flags) == 1
+        flagged_item_ids = set(rule_flags[0]["item_ids"])
+        route_item_ids = {item.item_reason: item.id for item in claim.items}
+        assert flagged_item_ids == {
+            route_item_ids["上海-深圳"],
+            route_item_ids["深圳-上海"],
+        }
+        assert route_item_ids["武汉-上海"] not in flagged_item_ids
+        assert route_item_ids["上海-武汉"] not in flagged_item_ids