Having same issue with OK Form 561-NR. I am using TurboTax download on Mac desktop to prepare a personal 1040. I do have capital from selling property in TX. My only OK income are royalties which are handed okay. (Not gracefully, but was able to get TT to accept correct information.) For capital gains, I entered 0 for Federal and 0 for OK when asked. (Never had access to a list of capital gains to annotate except in form mode and all entries looked okay.) TT is looping when I try to file on requiring an entry in an information field asking for the type of property sold even though TT shows 0 for values for Federal and OK amounts. (This on Line 3 of Form 561-NR.) All allowed entries assume the asset is in OK. I hesitate to enter a value in case it raises questions about accuracy of the 0 capital gain entry. Help!
