Deductions & credits

I think I found out why I'm getting this error. For my form 1040 line 64 (Federal income tax withheld from Forms W-2and 1099) I entered in my Federal Income tax withheld, which is a positive number, but it needs to be less than line 21 (Other income), which I entered in my notice 2014-7 as a negative value, thus giving me an error, since line 64 needs to be less than line 21, which it can't since it's a negative value.  Has anyone seen this error before and know how to fix it?