I understood what you wrote except there is no place during the MA interview to allocate the previously excluded income (entered in the federal return). There is a question in the MA return to allocate Dividend income so it only applies to MA but I don't see any place in TT to change the excluded amount carried over from federal to state so its allocated properly to both states.
I do see where to exclude additional income for MA, but the amount entered from the federal return for US debt obligations cannot be changed in the MA return.
I end up with too much excluded state income for both states and no way to adjust it.
