Subtraction of US Bond Interest

Hello,

 

my wife and I are Minnesota year-round residents, filing a joint return. She received a 1099-INT from the US Treasury that declares that she was paid an Annual Interest of $4,875. By a note on the back of the 1099-INT, this interest is "exempt from state and local income taxes," but it does not appear as a subtraction on the Minnesota tax form M1M that is generated by TurboTax. 

 

Please advise. This looks like a bug in the Turbo Tax system.