Answer:
If based on the other bank's claim that the funds were correctly dispsensed, you have concluded that no electronic funds transfer error occurred, and you are within your 45-day investgation timeframe, then yes you may revoke the provisional credit.
Notify the customer of your findings in writing and be sure to honor debits for 5 business days up to the amount of the revoked credit. If the customer asked for the documentation you used to make your decision, provide the documents supplied by the other bank in response to your claim.
First published on BankersOnline.com 2/18/13.