It does sound like it could have been a datum on-the-fly. I don't think it would show up in the reference viewer but not sure; it wouldn't show up in the model tree. You would be able to edit the definition and see the feature extruded to a reference that's not there. I'll look at the file tomorrow and let you know if I find something. You also might try ModelCHECK to see if it finds a reference to A.
↧