Components of an assembly that were created with PARTsolutionscan be marked as Component is Reference-Only (only works in the context of Teamcenter).
You will find the new key TC_ReferenceOnlyComponents at ifnxteamcenter.cfg
Value range: 0/1, 0 is default
If 1 is set, the Component is Reference-Only option is activated in NX > Assembly Navigator > Selected Component > Properties context menu command > Component Properties > Component dialog.