Did someone managed it, to correct the consumtion of the OBC?

In several BMW and X3 it is possible via the hidden OBC funtions/codes. There is under item 20 a correction factor, which could be set to the real consumption. But it seems, that they changed the menu. If I access the hidden functions the structure of the menu looks like in that thread of an 3er E46 http://www.x3world.com/x5-e53-forum/...ght=obc+hidden. My X3 is from 04/2006.

So has someone still that "Not used" item 20?

By the way 1st class Forum... Greats from GER.