Current exam manual has a whole section on this. To summarize:
• If you Customer is an originator, you are responsible for checking them, not the recipient,
• If your customer is the recipient, you are responsible for checking them, not the originator.
Here is the catch. If your customer is a batch originator, the above rules apply, as long as you do not un-batch the ACH Batch to process on-us transactions. If you un-batch, you are responsible to checking originator and recipient.
See exam manual for full discussion and explanation of rule and exception.
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The above is my opinion only, for what it is worth.
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Just my opinion for what it is worth