Depending on how your bank processes its transactions, it may be difficult to "match" the check used for purchase with the cashier's check in question. The annotation also provides an answer to the question (whether raised by the customer or by auditors), "What was this check used for?" Paticularly with checks payable to the bank, that can be an important question.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8