Controling lightify RGB(W) devices via homematic CCU2


I am trying to controll some Osram lightify device which I have added to my CCU2 from Openhab. They are created as virtual devices in the CCU2 after coupling with the lightify gw.
I can switch them on and off from OH but I cannot control the color.
Looking at the color channel of the thing in paper UI shows is as type string.

Any Idea what could be done here?

I have tried the lightify plugin as well, but unfortunately it only supports RGBW Devices and one of my devices is RGB.