Requiring non blank custom properties

Is there a way to require a field be filled in befor the filecan be checked into the vault?

Our Policy is that the note field be filled in so everyone knowswhat changed, like a revision block. However we have no way to makesure this happens. It cost time because you end up investigatingchanges.

Do I need to move to an enterprise system to enforce the policies?

SolidworksWorkgroup Pdm