Has anyone ever found out why when assembling or editing a definition (of constraints) a component or part in an assembly, the part disappears and makes it difficult to pick references. I have been working around this for many years and finally decided to ask, maybe we have a setting wrong in our config? Maybe Pro-e has a theory I do not understand? But as soon as I pick a "part" and say "edit definition" my window for constraints opens and my part hides itself in the tree and in the graphics area
. Or is there a method to pick the parts references before opening constraints?
I cannot set up constraints in our parts because they are used many places.

I cannot set up constraints in our parts because they are used many places.