Wierd Save As behavior...

About a month ago, I setup a new required IBA/soft attribute which was set to read-only from the start (off the profiles). About a week ago, I removed it from the profile to make "editable", as I was just starting with the validation that would be associated with the IBA. Everything worked fine, except when doing a Save As.

When you do a Save As, on a part that was created after the IBA was made editable, it always fails saying that the IBA is not provided - even though it was filled in on the original part.

I've never had a problem like this before, and I have a feeling it's something to do with adding/removing it from the profile. Anyone have any ideas?