Thank you for this feed back Ekaterina.
I totally aggree with your points, but the context is the following one :
my customer had a dedicated BW line for BPC, and we are now merging the regular BW line with the BPC one. There was no plan to upgrade anything, and things works fine on D, that's why we've kept on trying like this.
In worst case I still can take the backup I've used to move my environment from one line to another, but I'd like to use the standard "transport road" because this is the way it should work.
About missing informations :
I hope the upgrade server components step will come soon.
Rgds.
G.