Originally Posted by
MSPeconomist
On many tickets, the most restrictive rules of the (cheaper) fare code apply to the entire ticket. It may have been the case that this meant that your S fare rules also applied to the C portion, even though you were only changing the C flights.
I was -- correct or not -- under the assumption that not all the most restrictive rules apply to the entire ticket but that the IATA standard was that the more restrictive cancel/change restrictions generally apply to the whole.