What is your purpose in obtaining a WSUPP? A WSUPP is used to claim that a transaction wasn't authorized or that there is some other fault with the transaction that calls for a return of a debit (generally under the extended period adjusting entry rules). It's not designed for redirecting ACH items to a different account of your customer.
If the transaction should be returned for closed/dormant, NSF, etc., you only get one day to return it, and a WSUPP isn't needed. If the transaction should be redirected (it came in to a closed account and should be changed to a new account, or the account number's wrong), and you have the correct account information, use a NOC and force-post the item to the correct account. The Originator should respond to the NOC by correcting its records, but don't count on that happening. You should also tell your customer to contact the Originator directly to effect the change for future entries.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8