Got a client who is a VA resident and has a MD nonresident return. I get an error on the VA where it says "Credit allowed requires MD State Tax Return to be attached as a PDF to this return for EF. 

When I go to the the "E-File Option" and "Attach PDF Files" there are no files to attach. Where do I get the files and what file exactly does Proseries wants me to attach? Worse case scenario, I am sending it by mail, but prefer to E-file. 

Thanks.