diff --git a/docs/project/frontend-backend/backend-to-frontend-notes.md b/docs/project/frontend-backend/backend-to-frontend-notes.md
index 63233df..1852fc9 100644
--- a/docs/project/frontend-backend/backend-to-frontend-notes.md
+++ b/docs/project/frontend-backend/backend-to-frontend-notes.md
@@ -168,6 +168,7 @@ POST /api/auth/logout
 ```
 
 - `field_pointer` 必须是 RFC 6901 JSON Pointer，并且只能指向当前任务卡可编辑字段；后端会映射到矩阵 `field_path`。非法或只读字段会返回 `TASK_REVIEW_POINTER_INVALID`。
+- 同一次请求不能重复提交同一字段；重复 `field_pointer` 或重复映射到同一 `field_path` 会返回 `TASK_REVIEW_POINTER_DUPLICATE`。
 - `confirmed_order_id` 第一版必须等于当前任务的 `order_id`；如果前端需要选择其他订单，仍属于后续“复核场景订单归属选择”细化，不要复用普通任务切换订单能力。
 - 解阻成功后返回 `task_status=READY`、`review_status=RESOLVED`、`review_resolution.field_overrides[]`、`confirmed_payload` 和两条 `opera_operations[]`。前端应刷新任务详情并显示 OPERA 模拟操作入口。
 - 解阻过程不改写 `ai_payload_json`；用户修正值保存在 `review_resolution` 和 `confirmed_payload.field_values` 中。
diff --git a/docs/project/frontend-backend/frontend-to-backend-api-requests.md b/docs/project/frontend-backend/frontend-to-backend-api-requests.md
index c4a697c..731686e 100644
--- a/docs/project/frontend-backend/frontend-to-backend-api-requests.md
+++ b/docs/project/frontend-backend/frontend-to-backend-api-requests.md
@@ -560,6 +560,7 @@ Content-Type: application/json
 前端注意：
 
 - `field_pointer` 必须是 RFC 6901 JSON Pointer，并且只能指向任务详情 `fields[]` 中当前可编辑字段；只读字段或未知字段会返回 `TASK_REVIEW_POINTER_INVALID`。
+- 同一次请求不能重复提交同一字段；重复 `field_pointer` 或重复映射到同一 `field_path` 会返回 `TASK_REVIEW_POINTER_DUPLICATE`。
 - `confirmed_order_id` 第一版必须等于当前任务 `order_id`；普通任务任意切换订单继续后置。
 - type-known manual review 不能调用通用 `POST /api/reservation/tasks/{taskId}/confirm`；必须调用本节解阻接口，否则后端返回 `TASK_REVIEW_RESOLUTION_REQUIRED`。
 - `review_resolution.resolved_at` 是 UTC `Z` 时间点。
diff --git a/docs/project/requirements/M002-order-task-workflow-v3.md b/docs/project/requirements/M002-order-task-workflow-v3.md
index f2d5321..ce655d9 100644
--- a/docs/project/requirements/M002-order-task-workflow-v3.md
+++ b/docs/project/requirements/M002-order-task-workflow-v3.md
@@ -284,6 +284,7 @@ Agent payload 不可变。本系统在同一张卡上维护复核状态：
 - `missing_fields[]` 必须是 RFC 6901 JSON Pointer。
 - 入站阶段 `missing_fields[]` 不完整或不是 RFC 6901 Pointer 时，按 `adapter_contract_error` fail closed，不创建业务任务。
 - 解阻接口提交的 Pointer 必须能映射到该业务卡当前可展示且可编辑字段，否则返回 `TASK_REVIEW_POINTER_INVALID`。
+- 同一次解阻请求中 `field_overrides[]` 不允许重复指向同一 `field_pointer` 或同一矩阵 `field_path`，否则返回 `TASK_REVIEW_POINTER_DUPLICATE`。
 - 订单归属确认可作为复核解阻的一部分保存；当前第一版只允许确认当前任务所属订单，不开放普通任务随意切换订单能力。
 - 全部缺失字段、订单归属、目录值和依赖校验通过后，才进入 Preflight / READY。
 
diff --git a/server/src/main/java/cn/nianxx/thhotel/workflows/reservation/service/impl/ReservationTaskWorkflowServiceImpl.java b/server/src/main/java/cn/nianxx/thhotel/workflows/reservation/service/impl/ReservationTaskWorkflowServiceImpl.java
index f1475a6..f04ae46 100644
--- a/server/src/main/java/cn/nianxx/thhotel/workflows/reservation/service/impl/ReservationTaskWorkflowServiceImpl.java
+++ b/server/src/main/java/cn/nianxx/thhotel/workflows/reservation/service/impl/ReservationTaskWorkflowServiceImpl.java
@@ -807,9 +807,14 @@ public class ReservationTaskWorkflowServiceImpl implements ReservationTaskWorkfl
         Map<String, ReservationTaskCardFieldDefinition> definitionByPath = new LinkedHashMap<>();
         activeDefinitions.forEach(definition -> definitionByPath.put(definition.fieldPath(), definition));
         List<ManualReviewResolutionFieldOverrideResult> results = new ArrayList<>();
+        Set<String> seenPointers = new LinkedHashSet<>();
+        Set<String> seenFieldPaths = new LinkedHashSet<>();
         for (ManualReviewResolutionFieldOverrideRequest request : requests) {
             String fieldPointer = trimToNull(request == null ? null : request.fieldPointer());
             ReservationTaskCardFieldDefinition definition = findEditableDefinitionByPointer(definitionByPath, fieldPointer);
+            if (!seenPointers.add(fieldPointer) || !seenFieldPaths.add(definition.fieldPath())) {
+                throw reviewPointerDuplicateError(fieldPointer, definition.fieldPath());
+            }
             results.add(new ManualReviewResolutionFieldOverrideResult(
                     fieldPointer,
                     definition.fieldPath(),
@@ -818,6 +823,17 @@ public class ReservationTaskWorkflowServiceImpl implements ReservationTaskWorkfl
         return results;
     }
 
+    /**
+     * 构建重复复核字段错误，避免 confirmed payload 后值覆盖前值但审计保留多条冲突记录。
+     */
+    private ReservationTaskWorkflowException reviewPointerDuplicateError(String fieldPointer, String fieldPath) {
+        return new ReservationTaskWorkflowException(
+                HttpStatus.BAD_REQUEST,
+                "TASK_REVIEW_POINTER_DUPLICATE",
+                "复核字段指针重复。",
+                List.of(fieldPointer + ": 重复指向字段 " + fieldPath + "。"));
+    }
+
     /**
      * 复核 pointer 白名单使用当前卡型的可编辑字段全集；展示条件由合并后的 activeDefinitions 再兜底校验。
      */
diff --git a/server/src/test/java/cn/nianxx/thhotel/workflows/reservation/control/SuperAgentTaskResultControllerTest.java b/server/src/test/java/cn/nianxx/thhotel/workflows/reservation/control/SuperAgentTaskResultControllerTest.java
index 82b2b71..2987e11 100644
--- a/server/src/test/java/cn/nianxx/thhotel/workflows/reservation/control/SuperAgentTaskResultControllerTest.java
+++ b/server/src/test/java/cn/nianxx/thhotel/workflows/reservation/control/SuperAgentTaskResultControllerTest.java
@@ -1912,6 +1912,53 @@ class SuperAgentTaskResultControllerTest {
         assertThat(sourceTaskCount).isEqualTo(1L);
     }
 
+    @Test
+    void shouldRejectManualReviewResolutionWhenPointerIsDuplicated() throws Exception {
+        captureSourceMessage("mail-v3-manual-review-duplicate-pointer-001");
+        String body = typeKnownManualReviewBody(
+                "mail-v3-manual-review-duplicate-pointer-001",
+                "CNF-V3-MR-DUP-001",
+                "2026-09-05",
+                "2026-09-07");
+        MvcResult createResult = mockMvc.perform(signedPost(body, "nonce-v3-manual-review-duplicate-pointer-001"))
+                .andExpect(status().isCreated())
+                .andReturn();
+        String taskId = com.jayway.jsonpath.JsonPath.read(
+                createResult.getResponse().getContentAsString(),
+                "$.items[0].task_id");
+        String orderId = com.jayway.jsonpath.JsonPath.read(
+                createResult.getResponse().getContentAsString(),
+                "$.items[0].order_id");
+
+        mockMvc.perform(post("/api/reservation/tasks/{taskId}/manual-review-resolutions", taskId)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content("""
+                                {
+                                  "confirmed_order_id": "%s",
+                                  "field_overrides": [
+                                    {
+                                      "field_pointer": "/extracted_fields/pms_room_type_code",
+                                      "value": "RM3"
+                                    },
+                                    {
+                                      "field_pointer": "/extracted_fields/pms_room_type_code",
+                                      "value": "RM4"
+                                    }
+                                  ]
+                                }
+                                """.formatted(orderId)))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.error_code").value("TASK_REVIEW_POINTER_DUPLICATE"))
+                .andExpect(jsonPath("$.details[0]").value(containsString("/extracted_fields/pms_room_type_code")));
+
+        String taskStatus = jdbcTemplate.queryForObject("""
+                SELECT task_status
+                FROM workflow_reservation_task
+                WHERE id = ?
+                """, String.class, Long.valueOf(taskId));
+        assertThat(taskStatus).isEqualTo("PENDING_CONFIRM");
+    }
+
     @Test
     void shouldRejectManualReviewResolutionWhenMissingFieldsAreNotResolved() throws Exception {
         captureSourceMessage("mail-v3-manual-review-missing-001");