if you use the Where Do I Enter button and type 529, you get nothing? 

Line 12 is a subtotal -- which line would it be on the Form MO-A?

Right click on Line 12, does it have Cross Reference as an option?

I did that and it points me to Form 5632 - but when I enter the information, I get an error. It looks like that form is used for direct depositing your refund to the Missouri Section 529 (which I don't want to do). 

I just want to claim a deduction for the Section 529 contribution and I think it would be reported on Form MO-A....but I can't figure out which line item on Form MO-A.