Taking into cosideration WX, runway etc, FR has the policy to tanker when the fuel is cheaper where ever possible.
EG, normally at a home base airport the fuel prices are cheaper, therefore it makes more sense to take as much fuel as possible there so to minimise the uplift at the destination airport where it is more expensive.
And in reply to above, It was an aircraft from Hahn so should have been tankering?
YYZ