Homematic OPENHAB 2 no access to CUX items

I am using 2.0.0-SNAPSHOT Build #516 and I am trying to read CUX items.
e.g.:
Number Humidity_absolute_OG {channel=“homematic:HM-WDS10-TH-O:ccu:CUX9002003:1#ABS_HUMIDITY”}

Is there anything special with CUX items?
Do I have to create a gateway in the things definition?