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The event thing is ok. you can also add a gateway to check if the DM gets approved or not and then go back to the PM task.
Did you try to that?
Thanks for your help and advice ，u are right.
My idea goes into an erroneous zone.I think using multiple gateway will let the workfolw chart become very disorderly,so I want to try other ways .
when I see Mauricio's and your suggestion and view the related BPMN standard ,I optimized my process , using multiple disagree gateway and
as far as possible let workflow looks not so mixed and disorderly.