InfoPath Dev

I have a odd question. I am having a issue with one feild in my form. For some reason it requires users to select it, otherwise when users run a query it tells them that their query returned no data. I have 4 different drop boxes in this form and it is only this one feild that seems to be required. If you choose just this feild it will show data or this feild and any combination of other feilds. I have looked both at the form and the database and there is no difference between any of the feilds, besides the actual data the feilds hold. Any suggestions would be very much appreciated.

This seems a little weird, but I think it has to do with the data in the database. The query fields specify what the query should try to match when the query is issued, so if this one "required" field is the column in the database that is not null or has no matching values this would happen.

Well, in the end I just took the department feild out of the form, with the feild gone there is no longer a issue. Thank you for the reply though!