How to assign parallel task to role list avoiding that multiple user of same role can approve?

Hello, 
there is the possibility to create a parallel task assigned to a role list and avoiding that users of the same roles cannot approve same task?

For example:
Role list: Role A, Role B, Role C
Role A: User 1, User 2
Role B: User 3, User 4
Role C: User 5

Task X will be assigned to Role list, User 1,2,3,4,5 can see that task. User 1 approve, User 2 cannot approve because a user (user 1) of same role had approved before him. User 4 can approve because no other user with same role approved that.

At the moment this works only if every role has only one user. How can I solve it?

Thanks

Dear Mayra Rossi! It looks like the Community cannot answer your question. That's why we have opened a Support Request with the Number SR-138661-K2F8R for you. A Software Support Specialist will contact you directly to follow up. We will update this thread with the solution as soon as we have resolved the Support Request. With best regards, DocuWare Support Team