Reject a multi-instance task

[mystarrocks]

I am building a process model that has the following structure:

Start event -> User 1 Task -> Reviewer 1 Task -> Reviewer 2 Task -> ... Reviewer N Task -> End event, where N is dynamic.

The flow is essentially sequential - completion of any task will result in creation of next task in the flow (for instance, "User 1 Task" completion will result in "Reviewer 1 Task" being created and assigned to "Reviewer 1"), while rejection of any task will result in reopening/recreation of previous task (for instance, rejection at step "Reviewer 2 Task" will result in "Reviewer 1 Task" being reopened) in the flow.

Because N is 0 or greater, I intend to simplify this to:

User 1 Task -> Reviewer N Task, where "Reviewer N Task" is a multi-instance activity, with a loop cardinality of N, and type of "Sequential".

Having a completion condition helps me advance the flow when a task is considered complete, but how do I handle rejection of tasks in this multi-instance setup? Besides the rejection of subsequent review tasks, there's also the possibility of rejection of the first review task, in which case, I would want the flow to revert to step #1 (aka "User 1 Task").

I see no reason to extract the review steps into a separate call-activity/subprocess, but I am not sure if that will even help in this case.

Thoughts?

[abbask01 · Accepted solution]

If you have only a few number of tasks, then you can wait for other tasks to complete and check the rejection  using an exclusive gateway.

Alternatively use Boundary events: use a Boundary Error Event which would subsequently cancel all the remaining tasks in your cardinality. You can use flow from the event according to your requirement.