If a part is called by 2 assemblies Design Assistant may be used to open assembly 1 and rename the part. When Design Assistant opens assembly 2 to make the same change Design Assistant reports "File not found". Assembly 2 is loaded and all found files are displayed. The unresolved file is not listed at all so it is not possible to resolve the disconnect within Design Assistant.
It is necessary to close D.A., open Inventor, open Assembly 2 and resolve the missing file when prompted there.
It should be possible to do this entirely within Design Assistant.
Please either
1) List the unresolved file in Design Assistant and mark it in some way so that the user can Replace the file.
2) Open the resolve link dialog when the assembly is opened within Design Assistant, as is done when it is opened within Inventor.