I right-clicked it and chose Override. However, this actually does not work, at least not if you want to eFile. I got to the very end and it wouldn't let me eFile with this error. I called TurboTax support. After a bit of researching, they found that you have to clear it out in a worksheet in order to avoid the error. One of the very last forms in my Federal return is called Smart Worksheets. I think this is where we found and deleted the carryforward QBI. It didn't even require clicking override. If that isn't it, look at other forms that are Worksheets. IT's possible it is the 'Carryover Worksheet' but I'd start in the 'Smart Worksheet' and go from there.
