"I have to include (report) my 1099-B with my tax return, regardless if the DDS (gain from sale) amount is already included in Box1 or not."
That is correct.
"However, I would need to correct something (the "wrong" bases?) because otherswise the gain form the sale will be reported twice: once in box1 and once in 1099-B."
That is correct.
A+
