the easiest way is to just change the cost because it is not reported to the IRS and not enter a code
the 8949 instructions say If this transaction is reported on a Part I with box B checked at the top or if this transaction is reported on a Part II with box E checked at the top, enter the correct basis in column (e), and enter -0- in column (g) and enter code B. the only difference is the entering of the code or not.
