Hi
As Manuel explains, this combination was a deliberate decision to create unique link registers associated with the match person and roll. Imagine having 2000 objects with the same combination. If all these 2000 objects shared the same combination (meaning all combinations of people and roll with the same ID), and you were to change one of them, you would inadvertently change the 2000 objects that referenced this combination because the ID is shared. However, if every combination is unique, a change in one object would only affect that specific object (current behavior).
In my opinion, it's evident that using the link or search function to find and share linked and shared combinations is the most effective approach.
If none-one objects. I will change this behaviour in the next review cycle of the ontology.
Best