Override Interpart and Part Family creation.

[iamfallen]

Is it possible to have an overriding interpart expression in a part family? I was trying to create a charted assembly. I used an overriding interpart expression to pass a single expression back to a child in my assembly instead of creating a deform. It works great by itself, but now that I am trying to create a part family at this level I am getting an error:

Failed to update family member SG200124/001:
Locked by - SG200115/001 Foreign expression - "SG200114/001"::A12 will be deleted