IAR Cancel Refund participation means the void of a refund will also re-open the coupons at the carrier. This can only be done the same day that the refund was issued.
If the refund came from the GDS, you will not be able to void that refund the next day in IAR.
If the refund was entered in IAR, you can void the refund (cancel refund) only on that day in IAR.
Please refer to the Carrier ET Matrix at: www.arccorp.com/forms/ops/doc141.pdf