Access newbie here. I couldn't find the answer floating around, so I'm trying it here - I'm working on a database of contact info with two subforms - Events and Requests info. I've got the contacts all set and the Events all set, before I tackle Requests. I have a checkbox ("Tax Letter Sent?") that I bound to the Event_ID for it changes for every person and every event that person is involved in. It works - except that when I check the box, the Event_ID field goes to a "-1" category from something like "Welcome Home Dinner". When I change the Event_ID back to said event, the checkbox unchecks itself. How can I solve this? Thanks!