I was having a little trouble with that until I went back to the federal entry of this 1099R. I deleted the old one and entered it again. Make sure boxes 13 and 14 are complete. That is where it flows to the Oregon return.
When it asks "Where is this Distribution from?", mark Federal govt. retirements benefits.
When you revisit the Oregon State return on the page entitled "Here's the income that OR handles differently", revisit Retirement Ira and Pension Distributions. Click I received a federal pension.... That should get you to the Edit button.