Taxable amount unknown on Form CSA 1099R

[eprintax123]

I was doing 2023 taxes for retired parent. The taxable amount in box 2a was stated "Unknown" on the Form CSA 1099R. However, last year 2022 the taxable amount was given. Can use the taxable amount in 2022 to estimate the taxable amount for 2023? Turbo tax caution me to get this straight out before I proceed will completing taxes.