TT won't accept a valid code on my 1099 and won't let me efile with it there. Is there a way to override the final check?

I have a 1099R for  a total distribution. In box 7, the code is 2B. On the back of the 1099, B is described as designated Roth account distribution, which this is. But TurboTax keeps saying that B cannot be in that box: Box 7b distribution code is invalid. A distribution code of B should not be used for IRA distributions.

1. This is a 401k distribution, not an IRA distribution.

2. It IS a Roth distribution and the code is mentioned on the back of the 1099.

The system is not allowing me to efile because of this...every time I try to transmit, it takes me back to this entry to "fix" what isn't broken. Who might be able to help with this?

Thank you!