Yes. NACHA rules require a WSUPP for several types of ACH returns. But you need to separate NACHA rules from Regulation E.
Regulation E provides your customer with certain rights without regard to NACHA or card network rules. In rare cases, the NACHA or card association rules provide some extra rights to the consumer, but they can never take Regulation E's protections away.
Whether or not you obtain the WSUPP from your customer will determine whether your bank is able to recover funds that Regulation E often requires you to return to the consumer.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8