how to input "Loans from Shareholders" $0 ending balance?? can't e-file w/o & can't override!

When I try to file our s-corp extended return, it prompts me to fill in a number in Line C of one of the Shareholders' K-1's, for ending balance of Shareholder Loan. Beginning balance is correctly listed as 0, end balance should also be 0. There is no way to type a number in this line. I tried to fill in all 0s in the shareholder's debt basis worksheet, but that does not carry over onto this form - how the heck can I get this to show a zero?? I've looked all over for a place to type in shareholder loans (there are none, but there was a loan paid off several years ago that has been 0 for a while).

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