This message appears when i try to add a copied part into the assembly " adding the part into the assembly would create conflict of referances. Cannot add " how can i fix this to be able to add the part?

This message appears when I try to add a copied part into the assembly " adding the part into the assembly would create conflict of references. Cannot add " (see attached pic)how can I fix this to be able to add the part?

And when i tried to drag the part to the assembly it gives me the message "this part has references in the context of another assembly named ..." (see pic1)

Note that it's the same name as the assembly i'm working on!

Note: I've broken all external references for all parts.

FYI : The assembly is copied from another one