Hi Arlo,
thanks a lot for your quick response. I couldn't sleep right anymore, but now i fixed the problem.
Now my Midi-Interface is working properly with Set List Maker.

Your Answer was a push start thinking.
Finally i found the right hint in documentation of another Midi App (TouchDAW).
For this kind of connection you chose, debug-mode on USB-Interface must be enabled on Android device.
Midi Commander obviously communicate by another way with USB-Interface, so it is working without debug mode.
Now i am very happy and confident to build a working setlist with included Midi Program Changes.
Balu