1099-R Part D line 2

I have a 1099-R and this is for a fixed annuity that I receive under 'Joint and Survivor' pension plan, and the entire amount is taxable, and box 1 and 2a both have the same amount. During Review, TT forces me to enter some value in Line 2 of Part D. I tried entering zero but the error remains. 

Thanks in advance for any tips.

Raj , April 6, 2025