Artist Transport: Key Commands don't work SOLVED

I added some information within my second text: I’m not able to assign KEY-Commands - and this not only within the keypad-possibilities.
To be more precise: The assigning process within EUControl works as it should but I don’t get any effect within Cubase…

in other words:
We get 6 Softkeys, a numeric keypad and some transport keys with Artist Transport. Once assigned the EUCON-command “Play” for example it plays Cubase with all different keys we have.
But my problem is now assigning a KEY COMMAND!
Example: “Ctrl + z” (=UNDO). Even if the programming itself works well within EUControl UNDO doesn’t happen after pressing on the just programmed button within Cubase.