In the case of handwritten tickets this problem has caused grief to some in the past, so perhaps we should add a suggestion, or warning, to check that the issuing airline has in fact done the following:
Code:
104N . * WHEN A TICKET MUST BE HANDWRITTEN, IT IS
105N . NECESSARY TO MANUALLY INSERT AN SSR MESSAGE TO
106N . ADVISE THE TICKET NUMBER TO ALL CARRIERS IN THE
107N . ITINERARY. THIS WILL PREVENT THE OTHER CARRIERS
108N . FROM CANCELING SPACE DUE TO NO TICKET NUMBER.