Thanks PHV. at the time I removed relationships, tables contents, and form components one by one. My error went when I removed an unbound list box. It had nothing in it's row source. Replaced it and my error went away. I did your suggestion and it referred to having to have a related record, but that did not seem to be my error. Never mind, it's gone now, but I will remember that trick in the future and hope it provides a quick pointer as to whats wrong. Very useful