activiti多人审批驳回到上一环节问题。

上一环节A是多人审批通过到了多人审批的环节B，多人用的多实例并行，现在在环节B多人驳回到上一步，环节A多人代办接受到，请问这个驳回如何实现。activiti小白，求大佬指教。

节点跳转代码示例：

/**
 * 跳转至指定活动节点
 * @param processId  流程Id
 * @param targetTaskDefinitionKey  目标节点任务的id
 */
public void jump(String processId,String targetTaskDefinitionKey){
    //获取当前节点任务
    TaskEntity currentTask = (TaskEntity) taskService.createTaskQuery()
            .processInstanceId(processId).singleResult();
    jump(processId,currentTask,targetTaskDefinitionKey);
}
    
    
/**
 * @param currentTaskEntity 当前任务节点
 * @param targetTaskDefinitionKey  目标任务节点（在模型定义里面的节点任务Id）
 */
private void jump(String processInstanceId,final TaskEntity currentTaskEntity, String targetTaskDefinitionKey){
    ProcessInstance processInstance=runtimeService.createProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
    TaskEntity taskEntity=(TaskEntity) taskService.createTaskQuery().processInstanceId(processInstance.getId()).singleResult();  
   
    //获取流程定义
    ProcessDefinitionEntity processDefinitionEntity = (ProcessDefinitionEntity) repositoryService.getProcessDefinition(processInstance.getProcessDefinitionId());  
    //当前正在执行任务的节点  
ActivityImpl currentActivity = (ActivityImpl)processDefinitionEntity.findActivity(processInstance.getActivityId());
//跳转的目标节点  
ActivityImpl targetActivity = (ActivityImpl) processDefinitionEntity.findActivity(targetTaskDefinitionKey); 
          
((RuntimeServiceImpl)runtimeService).getCommandExecutor()
        .execute(new Command<java.lang.Void>() {
            public Void execute(CommandContext commandContext) {
                ExecutionEntity executionEntity = (ExecutionEntity) runtimeService
                         .createExecutionQuery().executionId(currentTaskEntity.getExecutionId()).singleResult();
                executionEntity.setActivity(currentActivity);
                executionEntity.setEventSource(currentActivity);
                //根据executionId 获取Task
                Iterator<TaskEntity> localIterator = Context.getCommandContext().getTaskEntityManager().findTasksByExecutionId(taskEntity.getExecutionId()).iterator();
                while (localIterator.hasNext()) {
                    TaskEntity taskEntity = (TaskEntity) localIterator.next();
                    //删除任务
                    Context.getCommandContext().getTaskEntityManager().deleteTask(taskEntity, "跳转节点", true);
                }
                executionEntity.executeActivity(targetActivity);  //设置任务 执行对象
                return null;
            }
        });
}