Under NY there is a section called, "Changes to Federal Income." The federal taxable amount of the 2020 withdrawal should appear under, "wage and retirement adjustment." If it is there, you would allocate zero dollars to New York.
If that doesn't work, go to "Credits and other taxes" within NY. From there, go to "Credits for Taxes Paid" and enter the amount paid to Oregon. The 2nd option wouldn't be the fairest, because NY has a higher tax bracket than Oregon. Instead of entering the amount paid put to Oregon, enter the amount NY is taxing you by.
