Ref Designator on Job set to 1 cant change

Hi,

I have a Job that is giving me an error when trying to release “Assembly 0 - SubAssembly 1 for Job BR43209-02 does not have the required quantity of Reference Designators.” I am not able to change the "Ref Designator to 0, when I hit save it just changes back to 1. I’ve checked all the parts and their methods, nothing has a 1 for the ref designator. What else would cause this?

Check your part.
Part > Revisions >Detail
Is the Validate Ref Designators box checked?