The following diagnostic is generating:

e-file: (Resident State) requires a PDF copy of (state) return to support the other state tax credit to be attached to the electronic return. (ref. #45535)   &  OH To qualify for the Pass-Through Entity Credit prepare and attach the applicable form, or indicate that a copy has been or will be faxed by checking the box Supporting Documentation for Credits Faxed to State in the Other Credits Screen. (ref. #45535)

Solution:

 Help Article