You will have to adjust you cost basis for the stock sold. Brokers do not adjust cost basis to account for the income reported when the RSUs vested. The value of the RSUs were added to you income, therefore, that same value is your cost basis in the RSUs. You will edit the saels transaction or transactions for the RSUs. It may be necessary to delete them and re-enter manually. You should enter the basis reported by the broker, and then enter an adjustment to the cost basis.
