Fedral Pensions

Oregon allows a deduction for Federal Pension payments earned prior to October 1, 1991.  The statute is ORS 316.680(1)(e) and the instructions for taking it are found on page 67-68 of the Department of Revenue 2020 Income Tax Instructions 105-101-431 (Rev 02-12-21).  There is a worksheet in these instruction that I've completed in prior years and it has passed the calculation on from year to year from prior returns (it is a percentage of the pension payment that remains unchanged from year to year).  Why is Turbo Tax not showing that subtraction?   How do I get it on my return?