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I think I understand now.  I normally have a gain on my K-1 from Section 1256 contracts.  This year I have a loss.  I can carry it back and spread it over previous years by amending my tax returns.   By unchecking Box D, I gave up the option of going back and getting a refund by spreading the loss to earlier years, and the error goes away.

I think I understand your statement about combining numbers.  When I input my data, I can enter a -87 on line 11zz.  Or I can combine 11zz and 13zz and enter -87 for line 11zz.  Is there a reason to combine them?

Thanks for your help.  I get no errors now.