I just filed my 2018 return which had been extended. I did NOT use the summary method for 1099-B transactions--do not know how to do this and never have done it. I used individual transactions imported from Quicken and adjusted manually. Imagine my surprise when, after I filed electronically, I was told that I must mail in Form 8953 with form 8949 attached. Several of my transactions in the Form 1099-B worksheets have adjustment code BM hardcoded into Line 19c of the Form 1099-B worksheet, which flows over to Form 8949. I assume the "M" initiates the Form 8953 requirement. Just to understand the program (I have already filed electronically, so I cannot change it), I tried to remove the BM and cannot. How can one "unelect" to file using the summary method? I can't even remove the adjustment code "B" in Line 18a because the program assumes I am using the summary method. Thanks.
