The carryover loss is already reflected in your Form 1040, so entering it for MA would be taking it twice.
To double-check:
1.
Go to Tax Tools on the left-hand side.
2.
Go to Tools.
3.
Go to View Tax Summary.
4.
Click Preview my 1040 from the left-hand
side.
If your loss has been subtracted from your federal income, and that amount has been transferred to your MA return, then it worked right.