Take care of a transaction that appears here right away. It won't be listed next time this window is open.
Don't just review the transactions in the Online Error Notification window and click Done with the intent of returning to the window at a later time to handle it. You are notified just once and must drill down to the source transaction window and follow the reversal procedure.
The next time you open the Online Error Notification window, only transactions that have been rejected since the last time you opened the window will appear.