Merging units

[STEF78]

Hello
I'm in June 42 turn 51 Russian side and it's still impossible to merge any unit.
Whenever I try, I get the same message: "No units in this hex may be merged"
I try to build up Rifle Division , Cavalry Corps, Tank Corps, Guards Rifle Division and Rifle Corps.
I have the last updated version of the game.
I must be stupid.
Any idea?
Thank you
Stéphane
NB: Except this point the game is fabulous!!!

[JAMiAM]

You need to use the combine units function to create the larger Soviet units. You do not use the merge function. The combine units button (green-circled) will allow you to create the larger units.

[STEF78]

It works!!!!!
Thank's a lot!
Back to Berlin now

Stéphane