I have a new to me return.  Prior year (2020), they elected the 3 year allocation of an IRA distribution(Coronavirus rules).  The full amount was taxed on Indiana using code 120 add back on Schedule 1.  I am trying to enter as a Code 147 deduction on Schedule 2 this year.  I am not finding where to enter this other than on the form as an override.  But the return get rejected as it doesn't want the code as an override.

HELP