Voids in the IAR report that the Transaction Type (TT) column shows as “CN” are System Cancelled voids.
A system cancelled void is created when there is a communication link problem between the GDS and the carrier. When the GDS sends a ticketing request message to a carrier and does not receive a response, the GDS then initiates a system cancel message, which alerts the carrier to void the ticket number.
A System Cancelled void will not generate an asterisk in the IAR transaction list despite a break in the ticket sequence. No action is needed on your part.