So basically I set up the account of my wife and myself to link to each other (redemption group setting). Using her Asia Miles number and my Marco Polo number.

I got about 100K miles and try to book a redemption ticket from her account, but I always get the message: "Not enough miles" for a booking that only takes 60K miles. Anything I do wrong? Is there anything I'm missing to let her use my miles for a flight? Or is this limited only to redemption of other stuff (not flights)?