I ASSUME you know the correct basis for the sale. It also sounds like you're trying to use the RSU step by step interview.
If both assumptions are correct then delete the trade that you've entered. There's no "income tax return" reason to use the RSU step by step interview, you can simply enter it as a plain-vanilla sale of stock.
Enter the 1099-B as it reads on the TurboTax default 1099-B entry form but then click on the "I'll enter additional info on my own " blue button. On the next page enter the correct basis in the "Corrected cost basis" box.
TurboTax will report the sale on Form 8949 "as reported by the broker" but will put an adjustment figure into column (g) of the Form, a code "B" into column (f) of the Form, and the correct amount of gain or loss which includes the adjustment.
Tom Young
NOTE: TURBOTAX CHANGES THE SECURITY SALES INTERVIEW JUST ABOUT EVERY SINGLE YEAR. THE INSTRUCTIONS ON "HOW TO FIX" THE BASIS REFLECT THE STATE OF THE INTERVIEW FOR TAX YEARS 2016 AND 2017
