In regards to filing MD Form 505-Nonresident Income Tax Return, I have been experiencing an issue with Line 45-Nonresident Tax Paid by Pass-Through's.  MD partnerships that withhold nonresident tax from partners distributions are reported on Form 510, Line D-1. Non Resident Tax paid by PTE.  For the past two years, I have been having issues submitting MD Form 510 with my MD-505 through ProSeries software.   I attached the form in the EF center and specifically select type Form "510 K-1" as the attachment.  The returns are received by Maryland but MD disallows the tax withheld claiming they did not receive the attachment. This form is required for all Nonresidents. I then have to respond to the MD notice and resubmit all the K-1's by fax.  Has anyone else has this issue?  Thank you for your help.