That is what I precisely did; So, no tax is calculated on that amount for MA tax (non deductible IRA converted to backdoor Roth ORA). That is good ; however, in the summary at the end of the state tax return, along with W2 amounts, turbo tax shows this amount also as additional income. It implies as though, this is additional income above and over w2s, which is not the case. This is part of already tax paid income of w2. My question is, would this create a problem, as though I did not pay tax on that amount?
No, it should not cause a problem assuming the funds used for the back door Roth IRA conversion were after-tax dollars that were essentially deposited into a traditional IRA for the sole purpose of funding your Roth IRA. Moreover, the TurboTax summary pages are not forwarded to the IRS. What is forwarded to the IRS is your federal return, schedules, and MA return.
To follow-up on the comments from @DanaB27, while the summary may show your back door Roth IRA conversion as additional income, what is most important is whether your MA return shows it as taxable income. It appears from your question that your MA return does not show the Roth IRA conversion as taxable income and that is what we want to see on your MA return.
@bhim80