I also have this problem. It cropped up after the last update, I think last Friday. TT computes some numbers, see CA (California for me) Form 540 > Part II > Interest You Paid. You can see an amount under Fed, Column A and your state "Additions" column C. Not sure how these numbers are calculated. Prior to the update, I did not get this error and was ready to submit.
I have entered a 1098 for a HELOC. I have deleted it and kept it in while entering the state adjustments either time and still get stuck. The interest should be deducted in my State but not the Fed.
When going through final check and fix errors, I get stuck at the same place as you all do.
