I have a form based directly on a details table. The underlying table contains an autonumber PK, date, equip number, odometer, and FK's to other related tables. A command button on this form opens another appropriate form based on another table and links the appropriate fields. I enter data into the first form then click the button to open the appropriate second form, enter data there and exit out of both forms. When I check the underlying tables, the second table is updated, but the first is not. I have looked at all the field properties etc of both forms and tables and cannot see any difference. Can anyone offer any suggestions as to what I may have missed? Thanks.