Workflow creation in documentum

Migrateduser

I am creating review object Activity in process builder, the performer can either be group or an individual and review notification should be sent to all members in group if group is selected as performer.

And workflow should not be finished if anyone from group completes the review. It should wait for everyone in group to complete or finish it.

I have selected performer as someone from group and selected workflow should complete once everyone complete review in transit tab. Still it is not waiting for everyone to finish review. It is finishing the workflow as soon one from group completes it.

Please help how this can be achieved.

Thanks