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- PMS sends OTA_ReadRQ message to PmsXchange requesting undelivered reservations.
- PmsXchange responds with OTA_ResRetrieveRS containing a single new reservation.
- PMS fail to process the retrieved reservation
- PMS sends OTA_NotifReportRQ confirming the reservation was NOT successfully processed
- PmsXchange returns an OTA_NotifReportRS in reply
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