Hi Steve
>Do you use the same button when saving a record that someone is editing?
No I have an Add/Save and an Edit/Save. This is what is in my edit/save button:

                DO CASE
			CASE ALLTRIM(UPPER(THIS.COMMAND8.CAPTION)) = 'EDIT'
				FOR START = 2 TO 16
					THISBOX = 'THISFORM.RFI_TEXTBOX'+ALLTRIM(STR(START))+'.READONLY'
					&THISBOX = .F.
				ENDFOR
				FOR START = 1 TO 3
					THISBOX = 'THISFORM.RFI_TEXTBOX'+ALLTRIM(STR(STRART)+'.READONLY'
					&THISBOX = .F.
				ENDIF
				THIS.COMMAND8.CAPTION = 'Save'
			CASE ALLTRIM(UPPER(THIS.COMMAND8.CAPTION)) = 'SAVE'
				BEGIN TRANSACTION
				IF TABLEUPDATE()
					END TRANSACTION
				ELSE
					ROLLBACK
					MESSAGEBOX('Record could not be updated.',64,'Error Upating'		)
				ENDIF	
				THIS.COMMAND8.CAPTION = 'Edit'
		ENDCASE

The PK is really assigned in the default value of the field in the table