I was interested to see if I could use Avios to fly from Paris to Dubai. Looking in April of 2014 I saw that I could fly form Paris Orly to London Heathrow on BA and then London to Dubai on a Qantas a380. However, when I went to click this it said: Error:Sorry, we cannot currently book the journey you have chosen. You may wish to reselect a different cabin, try again later, or call your service center.Is this not a valid routing? It lets me do it if both flights are on BA or Royal Jordanian.