"Other State Income Taxed by Indiana"

Hello,

I am a "Resident" of Indiana and "Non-resident" of Michigan. I am working on Indiana's tax credit for out of state work. Among the questions for this credit as "Other State (in my case Michigan) Income taxed by Indiana". Can anyone tell me where to find this number? I do not see it on my Michigan tax return, or I am not looking at the right place.