GBS gives constraint violation when class history removed
Instance variable constraints are specified in a server class definition by specifying a version of the class to which the inst var is constrained. If the version of the constrained class has been purged from the class version history, GBS may raise an error. This is because the constraint is pointing to a version of the class that no longer exists.
This only applies to GemStone/S servers.
Make sure all constraints specify the latest version of the class.