Yep, works fine for me too. I claim all my LH K class flights onto ANA after having my A3 Gold details in the booking during the journey. I initially just claimed one of these on ANA to get easier access to the award availability tool but now I'm thinking - maybe if I claim them all I'll have enough points by my 70th birthday (I currently have a whopping 1000 points) to treat myself to something amazing like a free ANA pen!