PHOENIX REJECTS A FORCE BOOKING

This error will be return if requested selling class is no longer available or flight gets full between OfferPrice and OrderCreate call then service will try to do force booking based on business eligibility rules. If force book fails then service will return the below error

<Error ShortText="Unable to process" Code="102">CBK21040 - THE BOOKING IS WAITLISTED - PHOENIX REJECTS A FORCE BOOKING</Error>

This can happen in live as well.