It seems like you might have this just a little off. Instead of having the value you would like to update in the checkbox, the checkox should be in the repeated region of the form and have it's value set to the id column from the recordset. You would then have a text field next to the checkbox for the value. If you have the multiple update setup like this it should only update the records where the checkbox is checked. If you bing the field you are trying to update to the text field any values that you update and check the box for should be updated. None of the other values should be updated.