I have a 1099-Int from a bank in Michigan for 401.79...number 15 and 16 on the form are filled in with...mi...and 300537225 but 17 is blank...tt says 17 needs a value?

I have a 1099-Int from a bank in Michigan for 401.79...numbers15 and 16 on the form are filled in with (mi) and (300537225) respectively but 17 is blank. tt says 17 needs a value?