I'm being asked repeatedly to complete box 16A and it is blank on both of my 1099R forms

You can try putting a zero in the box ($0.00), to see if that fixes the issue.

You could also try logging out of the program, and clearing your cache and cookies. ‌

Click here for instructions on how to clear your cache. 

Click here for instructions on clearing your cookies.

Make sure all updates have been made to your TurboTax program.  

Click here for instructions on manually updating your TurboTax program.

You could also try deleting your Form 1099-R and reentering it.

Click here for additional information on deleting forms in TurboTax.

If you have additional information or questions regarding this, please return to Community and we would be glad to help.