Thanks. Actually, I was not entering the data from a 1099B but downloading that 1099B from Schwab into Turbotax.
What I have done is to locate the specific short term sale in what Turbotax downloaded, changed the basis from 0 to the correct amount, then answered a few other questions in Turbotax about the transaction, all of which were "no". Later, when Turbotax runs a review I will see if it complains. Meanwhile I am still trying to get the Broker to amend the 1099B.
