R1410

Only one role of an Association can be aggregate or composite.

The composition and aggregation concepts illustrate a responsibility role, from the element that owns the AssociationEnd towards the target element. Therefore, this kind of responsibility cannot be both ways, and only one AssociationEnd may be composite or aggregate.

If you have an association with both ends composite or aggregate or a mix of these two, you should change one of its ends or create a second association.