That has been my understanding but a travel agent I've been dealing with in Maputo has reverted an email from Qatar saying "Kindly advise the passenger that his journey should end in the same country he initially originated from". My itinerary begins in MPM and ends in JNB. Obviously Qatar clearly has no clue about the rules but when I went to the rule sheet to provide the rule back to the TA, I was concerned about the "surface segment" language.