Retirement tax questions

I have the download version of Turbo Tax and just updated it with the Missouri forms available today.  The MO-A form is calculating my public pension correctly in Section A but then shows $0 in total in Section D - therefore, not deducting it from my taxable income on MO-1040 line 8.  Tried to manually enter the total in Section D but Turbo Tax will not let me.  Appears to be a bug in MO-A.  How do I report that.