Massachusetts resident working in multiple states - -Mass State return double counting W-2 income

I've completed my Fed return but have a Turbotax problem with data transfers to my Mass State return.  My large employer rightfully withheld PA income taxes for the time I was remotely working in PA.  But in my main W-2, my Box 1 and Box 16 for MA are identical. I then have a PA  w-2 with 0 in Box 1 and my PA wages in Box 16, along with the proper PA withholding.  All fine until Turbotax, for the Massachusetts Form 1 line 3 double counts the PA income, giving me an incorrect and much higher total of W-2s (and tax owed).  I have tried overriding the number with the correct number, but the override prevents e-filing the MA return.  Any solution, or do I need to file by US Mail (UGGH)???