Same in english… 
I can confirm that Lars’s configuration works for me, while Andy’s configuration did not.
Configuration is as follows:
Original configuration:
Ritto Plug Port A: red
Ritto Plug Port B: black
Configuration with Nuki:
Clamp left: Red Ritto
Clamp right: Red Nuki, Yellow Nuki
Ritto plug Port A: Green (Nuki), Orange (Nuki)
Ritto plug Port B: Black (Ritto), Black (Nuki)
Not sure, if this configuration is 100% correct. However it works for me with all tested functions, incl. ring-to.open and ring suppression.
Samson