Here's my problem. I've got a multi user situation with a front end and back end . I've got a form called po's with a subform called po lines. Occasionally when entering a record a user will be entering in the subform when their master record is deleted. The relationship between the two tables then doesn't allow the po line to be entered. The db has opptimistic locking, and another user has not deleted the record. Any possible ideas on how this could happen.