Desktop form 7203 will not let me fill in Part 1 line 8a (nondeductible expenses which came from K-1 line16C

Desktop

version Form 7203 Part 1 Shareholder Stock Basis will not let me enter a value in line 8a Nondeductible Expenses. The value came from line 16C on my K-1 1120-S.

Any help is appreciated