State tax filing

I received a letter from the state of Ohio stating that my amount reported for the nonresident credit has been denied.  When I called them they said it was because the IT NRC was not included.  I shared with them that I had not included it last year and didn't have a problem.  They said they got a new system this fall and it checks for this document and will deny the credit without the form.  The previous system did not have this check.