Include an explanation. More importantly, keep a copy with the CTR in your files to explain it to your examiner/auditor. Stuff happens, and a single error of this type isn't going to boil you in oil if you can explain it and demonstrate that you've put controls into place to lessen the chance of a repeat performance.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8