I have a client who would like to, ideally, be able to have a field in a form that is required to be unique, yet is able to have a re-usable default value. For example, an I.D. field with a default option of "n/a". Now, of course, this is self-defeating and contradictory but I can think of at least one way to represent this sort of outcome in a report generated by a field on a form that is limited to unique values. For one, I could create a check box that could accompany the input field on the form that could be checked if "n/a" was to be outputted on the report, but this still requires that the data entry technician create a unique "dummy" ID number while adding the extra step of checking a box. Are there any other not-too-complicated alternatives to my solution?