Assignment's rejection

This is not possible with the built-in assignments: the whole assignment is considered rejected if there's a single rejection. You would have to set up the task in some other way. This "majority approval" logic may require developing a custom extension.

Thanks for your reply Joonas.

Could it be done with property calculator ?

We can calculate total assignees on create and compare the count of marked as approved and marked as rejected on every checkin. then we can compare the number of approve rejects until we reach total assignees number. Lastly, we can set another property as "approved" or "rejected".

We can then make an automatic transition to next state using this information.

I thought about it, but the issue is that as soon as one recipient declines, the tasks of the other recipients are no longer displayed.