Creo Elements Direct Modeling - Advanced Assemply/Parametrics
All Modeling Versions
If you have loaded multiple instances of an assembly with a relationship set in Modeling, the path in the relationships always refers to the originally created instance of the assembly or to the assembly loaded first.
This leads to problems if you want to edit the assemblies alternately. The path in the relationship set cannot be changed to the other instance, and thus numbering cannot be performed on it either.
It is not possible to change the relationship set afterwards, which would be very helpful