I recently had an OAL-ticket (745-stock) where I upgraded the UA-flights on this, and every time a segment cleared (total of three), the travel-agency I booked this through had to reissue the ticket resulting in a new ticket number...

So in the end I had a list of four ticket numbers, original booking and one each after each upgrade cleared with the last one the only one valid. And when looking the ticket up on the saudia-website, my ticket now showed R-class for all segments that I had upgraded.

Greetings - Dirk