There are two ways to cancel an automatic payment:
A user can cancel an automatic payment (refer to How To Cancel A Tender) at any time. You would do this if the financial institution rejected the automatic payment.
For legacy billing, the system will cancel an automatic payment behind-the-scenes if the related bill (if any) is reopened before the automatic payment is interfaced to the financial institution. When you recomplete the bill, the system will create a new automatic payment that reflects the new amount due (and the canceled automatic payment will net out the original automatic payment).
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