>I have a field, pr_nbr, that when the focus is lost, checks for the existence of another pr_nbr in the file that matches the one the user just lost the focus of. If there is a match, I want the focus set back to the pr_nbr but the focus always goes to the next object. I've instituted a 'thisform.pr_nbr1.setfocus but itdoes not matter.

You could move your code into Valid event, and return .F. over there if you want to stay in the textbox.