Originally Posted by
ft101
However, if there's two sets of Fare Rules, the most restrictive condition applies to the entire itinerary.
In effect this means that despite one direction of travel not having the "CHK-IN REWARD UPGRADE" endorsement it effectively does, as the other direction of travel's rule is applied.
That depends on the fare rules; it is definitely not always the case that where there are multiple fare componants that the most restrictive applies