fix 7597 (#7598)

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/enums/Status.java

@@ -293,6 +293,7 @@ public enum Status {
     MAIN_TABLE_USING_VERSION(50053, "the version that the master table is using", "主表正在使用该版本"),
     PROJECT_PROCESS_NOT_MATCH(50054, "the project and the process is not match", "项目和工作流不匹配"),
     DELETE_EDGE_ERROR(50055, "delete edge error", "删除工作流任务连接线错误"),
+    NO_SUPPORT_UPDATE_TASK_DEFINITION(50056, "task state does not support modification", "当前任务不支持修改"),
     HDFS_NOT_STARTUP(60001, "hdfs not startup", "hdfs未启用"),
 
     /**

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/TaskDefinitionServiceImpl.java

@@ -247,15 +247,15 @@ public class TaskDefinitionServiceImpl extends BaseServiceImpl implements TaskDe
         if (result.get(Constants.STATUS) != Status.SUCCESS) {
             return result;
         }
-        if (processService.isTaskOnline(taskCode)) {
-            putMsg(result, Status.PROCESS_DEFINE_STATE_ONLINE);
-            return result;
-        }
         TaskDefinition taskDefinition = taskDefinitionMapper.queryByCode(taskCode);
         if (taskDefinition == null) {
             putMsg(result, Status.TASK_DEFINE_NOT_EXIST, taskCode);
             return result;
         }
+        if (processService.isTaskOnline(taskCode) && taskDefinition.getFlag() == Flag.YES) {
+            putMsg(result, Status.NO_SUPPORT_UPDATE_TASK_DEFINITION);
+            return result;
+        }
         TaskDefinitionLog taskDefinitionToUpdate = JSONUtils.parseObject(taskDefinitionJsonObj, TaskDefinitionLog.class);
         if (taskDefinitionToUpdate == null) {
             logger.error("taskDefinitionJson is not valid json");