Did you apportion his wages in his Massachusetts state return. As you prepare his Mass state return, you come to the apportionment screens asking to separate his Mass income from non-mass sources. Scroll through his Mass return and the apportionment screens to see if there are numbers that shouldn't be there. Also if you reported other income like interest and dividends or unemployment make sure you indicate these are from Non-Mass sources.
Also check to see if his Mass state wages matches his federal wages from the coreected W2. If there is a difference in numbers, then that difference would be construed as non-mass income.
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