Created business objects not are not added to the diagram

[philip-alldredge]

In some cases, business objects created with the graphical editor are not added to the active diagram. This is caused by #2413 . In the past, the editor would create a reference for the new business object in most cases. Now that the graphical editor does not build references for proxies, the problem is more apparent.

The recommended solution is to store relative references as soon as possible so that that the editor does not need to get a reference for a proxy.

[philip-alldredge]

Implemented by #2425