diff --git a/xiaoqu-agent-service/src/main/java/me/iiv/agent/entity/m2/ContractNew.java b/xiaoqu-agent-service/src/main/java/me/iiv/agent/entity/m2/ContractNew.java
index a567150..a098098 100644
--- a/xiaoqu-agent-service/src/main/java/me/iiv/agent/entity/m2/ContractNew.java
+++ b/xiaoqu-agent-service/src/main/java/me/iiv/agent/entity/m2/ContractNew.java
@@ -159,4 +159,10 @@ public class ContractNew implements Serializable {
      * 终止详细原因
      */
     private String stopReason;
+
+    /**
+     * 续签来源合同id（新合同指向其续签的旧合同，单向；旧合同行不反向引用）。
+     * 2026-10-15 核对：表实际存在 renew_source_id 列，此前遗漏导致续约关联未进入同步报文。
+     */
+    private Long renewSourceId;
 }
diff --git a/xiaoqu-agent-service/src/main/java/me/iiv/agent/mcp/sync/ContractsSyncEntity.java b/xiaoqu-agent-service/src/main/java/me/iiv/agent/mcp/sync/ContractsSyncEntity.java
index 65e5d8d..d995a72 100644
--- a/xiaoqu-agent-service/src/main/java/me/iiv/agent/mcp/sync/ContractsSyncEntity.java
+++ b/xiaoqu-agent-service/src/main/java/me/iiv/agent/mcp/sync/ContractsSyncEntity.java
@@ -27,7 +27,8 @@ import java.util.stream.Collectors;
  * 字段口径（2026-09-14 字段核对）：owner_user_id → sale_id（稳定 user.id）；
  * customer_id 经 property_id 回查 properyt.customerId（金蝶客户 id）；金额转分（amount_minor）；
  * start_at/end_at 为带时区 ISO；version 由 modify_time 派生（表无 version 列，决策 1）。
- * 表无 currency / renewal_of_contract_id / renewal_result / deleted_at 列，按铁律"表里不存在的字段不造"省略，
+ * 表无 currency / renewal_result 列，按铁律"表里不存在的字段不造"省略；
+ * renewal_of_contract_id 由表列 renew_source_id 映射（2026-10-15 核对补入，此前按无列省略属误判），
  * 软删 tombstone 的 deleted_at 以 modify_time 充当。
  * 行级权限：Token 绑定人时走 PermissionService.applyContractRowFilter（与 contract.list.query 同一 ACL）。
  */
@@ -121,6 +122,7 @@ public class ContractsSyncEntity extends AbstractSyncEntity implements SyncEntit
                 stableId(row.getPropertyId()), stableId(row.getSaleId()),
                 row.getSaleName(),
                 Integer.valueOf(1).equals(row.getExpireRemind()), row.getRemindDays(),
+                stableId(row.getRenewSourceId()),
                 ChangesEngine.iso(effective), mt, deleted ? ChangesEngine.iso(effective) : null));
     }
 
diff --git a/xiaoqu-agent-service/src/main/java/me/iiv/agent/mcp/sync/SyncChangeSchemas.java b/xiaoqu-agent-service/src/main/java/me/iiv/agent/mcp/sync/SyncChangeSchemas.java
index c68708d..a664cd6 100644
--- a/xiaoqu-agent-service/src/main/java/me/iiv/agent/mcp/sync/SyncChangeSchemas.java
+++ b/xiaoqu-agent-service/src/main/java/me/iiv/agent/mcp/sync/SyncChangeSchemas.java
@@ -70,6 +70,7 @@ final class SyncChangeSchemas {
             @JsonProperty("owner_name") String ownerName,
             @JsonProperty("expire_remind") boolean expireRemind,
             @JsonProperty("remind_days") Integer remindDays,
+            @JsonProperty("renewal_of_contract_id") String renewalOfContractId,
             @JsonProperty("updated_at") String updatedAt,
             long version,
             @JsonProperty("deleted_at") String deletedAt) {
diff --git a/xiaoqu-agent-service/src/test/java/me/iiv/agent/mcp/sync/SyncEntitiesTest.java b/xiaoqu-agent-service/src/test/java/me/iiv/agent/mcp/sync/SyncEntitiesTest.java
index 8e14d4c..0b3bc06 100644
--- a/xiaoqu-agent-service/src/test/java/me/iiv/agent/mcp/sync/SyncEntitiesTest.java
+++ b/xiaoqu-agent-service/src/test/java/me/iiv/agent/mcp/sync/SyncEntitiesTest.java
@@ -22,9 +22,12 @@ import org.mockito.junit.jupiter.MockitoExtension;
 
 import java.math.BigDecimal;
 import java.sql.Timestamp;
+import java.util.ArrayList;
 import java.util.List;
+import java.util.Map;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
@@ -227,6 +230,37 @@ class SyncEntitiesTest {
         assertEquals("2026-09-01T13:54:21+08:00", rows.get(0).item().get("deleted_at"), "软删行返回 tombstone");
     }
 
+    @Test
+    void contractsMapsRenewalSourceIdToWireField() {
+        // 回归：m2.contract_new.renew_source_id 是续签关联列（新合同单向指向旧合同）。
+        // 2026-10-15 前实体未映射该列，变更流与 current 报文均丢续约关系，
+        // 下游 CRM 无法识别"旧合同已被续约"，R04 事项永远不会自动关闭。
+        ContractsSyncEntity entity = new ContractsSyncEntity(contractNewMapper, properytMapper, permissionService);
+        ContractNew contract = new ContractNew();
+        contract.setId(23L);
+        contract.setContractNo("452542C007");
+        contract.setContractStatus(2);
+        contract.setPropertyId(1L);
+        contract.setSoftDelete(0);
+        contract.setRenewSourceId(22L);
+        contract.setModifyTime(Timestamp.valueOf("2026-10-15 13:30:00"));
+        // fetchCurrent 会原地 sort  mapper 返回的列表，桩必须每次给可变新实例
+        when(contractNewMapper.selectList(any())).thenAnswer(inv -> new ArrayList<>(List.of(contract)));
+        when(properytMapper.selectBatchIds(anyList())).thenReturn(List.of());
+
+        List<SyncRow> rows = entity.fetchPage(null, 2000L, null, null, 3, null);
+        assertEquals("22", rows.get(0).item().get("renewal_of_contract_id"), "变更流必须输出续约前合同");
+
+        List<Map<String, Object>> current = entity.fetchCurrent(List.of(23L), null);
+        assertEquals(1, current.size());
+        assertEquals("22", current.get(0).get("renewal_of_contract_id"), "current 接口必须同步输出续约前合同");
+
+        // 非续签合同的该列为 NULL：字段按 NON_NULL 整体省略，不得出现 null 值键
+        contract.setRenewSourceId(null);
+        List<SyncRow> plain = entity.fetchPage(null, 2000L, null, null, 3, null);
+        assertFalse(plain.get(0).item().containsKey("renewal_of_contract_id"), "无续约来源时字段应省略");
+    }
+
     @Test
     void contractsRejectUnknownLegacyStatus() {
         ToolCallException error = assertThrows(ToolCallException.class,