请教下，activiti6 子流程嵌套 子流程会签后流转异常
流程图如下，在所子流程里面，执行完村镇审核之后，应该回归到县级并行子流程中的 县-工单评价，但程序报错
报错日志
15:25:54.490 [http-nio-21201-exec-19] ERROR o.a.e.i.i.CommandContext - [logException,122] - Error while closing command context
org.apache.ibatis.exceptions.PersistenceException:
Error updating database. Cause: java.sql.SQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (tzzx_sys.act_ru_task, CONSTRAINT ACT_FK_TASK_EXE FOREIGN KEY (EXECUTION_ID_) REFERENCES act_ru_execution (ID_))
The error may exist in org/activiti/db/mapping/entity/Execution.xml
The error may involve org.activiti.engine.impl.persistence.entity.ExecutionEntityImpl.deleteExecution-Inline
The error occurred while setting parameters
SQL: delete from ACT_RU_EXECUTION where ID_ = ? and REV_ = ?
Cause: java.sql.SQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (tzzx_sys.act_ru_task, CONSTRAINT ACT_FK_TASK_EXE FOREIGN KEY (EXECUTION_ID_) REFERENCES act_ru_execution (ID_))
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:199)
at org.apache.ibatis.session.defaults.DefaultSqlSession.delete(DefaultSqlSession.java:212)
at org.activiti.engine.impl.db.DbSqlSession.flushDeleteEntities(DbSqlSession.java:770)
at org.activiti.engine.impl.db.DbSqlSession.flushDeletes(DbSqlSession.java:733)
at org.activiti.engine.impl.db.DbSqlSession.flush(DbSqlSession.java:419)
at org.activiti.engine.impl.interceptor.CommandContext.flushSessions(CommandContext.java:197)
at org.activiti.engine.impl.interceptor.CommandContext.close(CommandContext.java:75)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:72)
at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:47)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140)
at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:45)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:29)
at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:44)
at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:39)
at org.activiti.engine.impl.TaskServiceImpl.complete(TaskServiceImpl.java:186)
at com.ruoyi.tzzx.activiti.service.impl.ProcessServiceImpl.complete(ProcessServiceImpl.java:191)