Do you know, that… ?

When designing in the context of – ie editing component from the deposit – You can not add another reference.

The message reads:

This part of the operations is defined in the context of another assembly <name>. You can edit the part but do not create any external references to the components of the current deposit.

How to solve it?

The solution is to select options in the system > External References field Allow multiple contexts for parts when editing in the assembly. Thanks to its selected, you can create a reference to an external part of the more than one context submission, but each individual operation or sketch within the assembly may have only one external reference.