State tax filing

I understand (and did) all you said already.  The problem is it requires me to select 1 of 5 options from a drop down box.  The current selection is "<BLANK>" and that's unacceptable to the system.  The 5 options are all things like "sold property in OK".  Selecting any of the available option would make the line item taxable in OK.  I could select some bogus option and still keep it 0 dollars, but it's wrong.