Thank you very much for your help! Its really appreciated!!
Unfortunately I got a new (old) problem with one of my “Fibaro Dimmer 2” 's. When I operate the dimmer using the switch on the dimmer, this information is not sent to Openhab. The firmware version is different from the ones working. This one has firmware version 3.4 (not working). The rest has version 3.5 (working). All setting looks identical. I tried mapping all channels but no luck. I also set the Lifeline to the controller.