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A notice by a broker to a client that the broker has made a mistake and has taken steps to rectify it. For example, if a client makes an order to buy 1,000 shares and the broker mistakenly buys 2,000, he/she must sell the extra 1,000 shares and bear any losses himself/herself. Afterwards, the broker must inform the client of what has transpired and provide full documentation. This ensures that the broker simply made a mistake and was not trading maliciously or improperly.
A broker's notice to a customer that an erroneous trade credited to the customer has been voided. For example, if a brokerage firm mistakenly purchases 200 shares of stock for an account when the customer has entered an order for only 100 shares, the firm will send the customer a cancellation for the 200-share trade to void the original confirmation and then will send a new confirmation showing the correct trade.