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 1c6af52..c190863 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
@@ -7,7 +7,9 @@ public enum ErrorCode {
     SUCCESS(200, "操作成功"),
     PARAM_INVALID(40010, "参数错误"),
     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_PARENT_LOOP(40921, "iParentId 不能等于自身或后代"),
     INTERNAL_ERROR(50000, "服务器内部错误");
 
     private final int code;
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 e2d6aab..d48995b 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
@@ -48,5 +48,7 @@ class ApiResponseTest {
         assertThat(ErrorCode.MOD_PARENT_NOT_FOUND.getCode()).isEqualTo(40411);
         assertThat(ErrorCode.MOD_PROC_NAME_DUP.getCode()).isEqualTo(40911);
         assertThat(ErrorCode.INTERNAL_ERROR.getCode()).isEqualTo(50000);
+        assertThat(ErrorCode.MOD_NOT_FOUND.getCode()).isEqualTo(40421);
+        assertThat(ErrorCode.MOD_PARENT_LOOP.getCode()).isEqualTo(40921);
     }
 }