The request is used in case Bet Engine made a ticket’s rollback.
Rollback happens when the ticket is originally set one way, but later (can be minutes or sometimes even days after) the results are changed and the ticket is set differently. A ticket’s rollback means that ticket status changes to the previous ticket status (open) and then it can be set to the opposite. After successful response Bet Engine should make a ticket_win / ticket_lost / ticket_void request.