Please go back to 2019 Sch D data entry.  The 8949 box letter (A, B, C, D,...) is the only good thing about the new 2020 form 1099-B method of entry when entering a few transactions.  There is no way I can find to enter summary information and simply attach a pdf file if there were any Wash Sales.  The code "M" used with a wash sale displays an error message to either remove the wash sale amount or remove the "M" code.  How is one supposed to handle 30 pages of stock tranactions with multiple sales dates?