UPDATE:

Just to let you know. It worked out fine with my "2 segment upgrade".
First I had only the second leg upgraded, but now as the first one also became available, they redeposited the miles and upgraded the whole trip (at the cheaper rate).

I am now just a bit puzzled, cause in my eticket receipt it says BC, but the luguage limitation is still 20kgs. Is that true or just a glitch ?

Cheers
TheAirman