I found the same issue of $6000 already taxed Roth IRA conversion money being taxed by MA.
After trying a few things, I believe there is a bug in the linkage of Form1NR/PY with schedule X.
1. Schedule X has the $6000 logged as previously taxed by MA and line 7 shows "0".
2. Form 1 NR/PY line 11 does not react to any changes on schedule X. Still carries $6000 as other income.
3. side note: Form 1 NR/PY line 11 says other income from schedule X line 6. While latest from from mass.gov says line 7 which is correct.
Please advice how the $6000 can be removed without overriding the number.
