How can i undo or redo a completed human task node?

i hava two human task node named A and B in a flow process, when the A is completed and the B has not been completed ,i want to reject the process to the Taks A ,How can i do for it?Thanks

You cannot reopen a completed task. But you can go back to that task and create a new instance of it. But to be clear you can’t redo the previous instance. As per:

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