Portland MET-40/MET-40-NP requires a PDF copy of the Oregon return filed with the Oregon Department of Revenue. Please attach and specify type of return filed.
Go to the efile screen for PDF attachments in Screen 4.4. Scroll to the bottom where it says Oregon Information. Make sure you have clicked the box(es) *Send PDF Attachment with MC-40* (and/or MET-40). Next, use the drop down under Oregon main return/Other Attachments and choose Form OR-40.