Thank you, Keter.
Routing would be DRS-AMS-CDG-KEF, SO KEF wouldn't be the origin. But I think it is not one of the allowed routings.
Thanks for the second info, though. Very helpful. So on
DRS-AMS-CDG-SVO-IKT-SVO-CDG-IST-CDG-TLV-CDG-AMS-DRS two of the stops in Paris have to be stopovers?