diff --git a/backend/src/main/java/com/xly/erp/common/response/ErrorCode.java b/backend/src/main/java/com/xly/erp/common/response/ErrorCode.java
index c190863..54b2f9a 100644
--- a/backend/src/main/java/com/xly/erp/common/response/ErrorCode.java
+++ b/backend/src/main/java/com/xly/erp/common/response/ErrorCode.java
@@ -9,6 +9,7 @@ public enum ErrorCode {
     MOD_PARENT_NOT_FOUND(40411, "父模块不存在或已删除"),
     MOD_NOT_FOUND(40421, "模块不存在或已删除"),
     MOD_PROC_NAME_DUP(40911, "存储过程名称已存在"),
+    MOD_HAS_REFERENCES(40912, "存在子模块或外部业务引用，禁止删除"),
     MOD_PARENT_LOOP(40921, "iParentId 不能等于自身或后代"),
     INTERNAL_ERROR(50000, "服务器内部错误");
 
diff --git a/backend/src/main/java/com/xly/erp/module/mod/vo/ModuleDeleteResultVO.java b/backend/src/main/java/com/xly/erp/module/mod/vo/ModuleDeleteResultVO.java
new file mode 100644
index 0000000..f5bd2f6
--- /dev/null
+++ b/backend/src/main/java/com/xly/erp/module/mod/vo/ModuleDeleteResultVO.java
@@ -0,0 +1,17 @@
+package com.xly.erp.module.mod.vo;
+
+import lombok.Data;
+
+/** REQ-MOD-003 模块删除返回精简 VO（仅含主键 + 删除标记） */
+@Data
+public class ModuleDeleteResultVO {
+    private Integer iIncrement;
+    private Boolean bDeleted;
+
+    public static ModuleDeleteResultVO of(Integer id, Boolean deleted) {
+        ModuleDeleteResultVO v = new ModuleDeleteResultVO();
+        v.setIIncrement(id);
+        v.setBDeleted(deleted);
+        return v;
+    }
+}
diff --git a/backend/src/test/java/com/xly/erp/common/response/ApiResponseTest.java b/backend/src/test/java/com/xly/erp/common/response/ApiResponseTest.java
index d48995b..12eebe3 100644
--- a/backend/src/test/java/com/xly/erp/common/response/ApiResponseTest.java
+++ b/backend/src/test/java/com/xly/erp/common/response/ApiResponseTest.java
@@ -50,5 +50,6 @@ class ApiResponseTest {
         assertThat(ErrorCode.INTERNAL_ERROR.getCode()).isEqualTo(50000);
         assertThat(ErrorCode.MOD_NOT_FOUND.getCode()).isEqualTo(40421);
         assertThat(ErrorCode.MOD_PARENT_LOOP.getCode()).isEqualTo(40921);
+        assertThat(ErrorCode.MOD_HAS_REFERENCES.getCode()).isEqualTo(40912);
     }
 }