Claimant's total Missouri subtractions from the other state smart worksheet?

I live in Missouri but work in Kansas so I've been filling out the MO-CR form for years. This is the first time this error has ever showed up in TurboTax when I run the review.

 

I looked on past year returns but this isn't on them 

 

Under the section titled "Claimant's total Missouri subtractions from the other state smart worksheet?"

 

on line B it wants me to fill in a number for "Claimant's total Missouri subtractions from the other state"

 

I'm not sure what it's asking. Where would I find what it's looking for? Maybe somewhere on my Kansas return?