Thanks, fanfare.
I do have an M in the codes column F on Form 8949, however the amount of adjustment in column G is zero. The instructions state:
If you enter an amount in column (g),
enter a code in column (f).
Seems to me if column G is zero, TT should not have entered the code M in column F. I will mail it in with my supporting documentation any way just to be on the safe side.
