When I do training for our Customer Service Reps, I always tell them to remember that Stop payments are proactive and the Written Statement of Unauthorized Debit is reactive.
At my old job, where I developed all the forms, we actually stated right on the form: " For transaction(s) already posted to the account" and "For transaction(s) not yet posted to the account". This was listed right under the header of "Stop Payment Form" and "Affidavit of Unauthorized Activity". Very basic (and I hated adding that on) but it helped.
We also use the same form for check stop payments and ACH stop payments to help eliminate some of the confusion.
I actually had to the opposite and separate the form in order to help employees "get it"
