I automatically uploaded a lengthy 1099 from my broker. I subsequently received a corrected 1099 with one small change to the cost basis on a stock sale. I manually went to the form and used an override to correct the impacted capital loss transaction.
When I run Smart Check, I am getting a warning not to override the electronically provided numbers.
Do I need to reload the complete 1099 again instead of correcting it manually?
Yes, editing numbers with an override on an imported 1099 will cause you to not be able to Efile.
Either delete the import and re-import, or delete the import and use the Summary Method to report your transactions.
Here's more info on How to Update or Delete Imported Data.