Definition - What does Erroneous Report mean?
Erroneous Report is a report of an execution given in error to a client. The report is not binding on the firm or on the agent.
Testopedia explains Erroneous Report
If a trade execution is reported to a client at a price and it later turns out that the trade was actually executed at a different price an erroneous report has occurred. The client must accept the trade terms as the trade actually occurred. If however the order was executed at a price that was away from the customer's limit price or for more shares than the customer wanted to buy or sell those issues would not be binding upon the customer.