Directly from SABRE...hopefully this helps:
1 INTERCONTINENTAL DEPARTURE AND 1
INTERCONTINENTAL ARRIVAL PERMITTED
IN EACH CONTINENT EXCEPT AS FOLLOWS:
2 PERMITTED IN EUROPE TO/FROM/VIA
AFRICA (EXCEPT NAMIBIA/SOUTH AFRICA/
ZAMBIA/ZIMBABWE). 1 MUST BE A TRANSIT WITHOUT STOPOVER BETWEEN AFRICA AND ANOTHER CONTINENT.