If you have a 1099-B with proceeds only the company doesn't have the other information.
Do you recognize the transaction?
You have to enter the rest of the information from your own records.
You can't have two dates Disposed for one transaction.
Each Date Disposed should be reported.
Do your records show transactions on those dates?
Since there are not two proceeds for two dates, you can ignore one of them unless you recognize that date in your records.
