Works great in the Citroen C4 Picasso

I let the adapter installed by a workshop in my Citroen Citroen C4 Picasso today. He was connected to the built-Continental RD4 radio via the CD changer port and the red cable to the ignition. It took a while to find the right ignition cables, and the CD changer connection must first be unlocked, but now I can play music via Bluetooth by I select the CD changer on the radio and then connect my phone via Bluetooth with a diagnostic computer and Enjoy the music. The Skip to the previous / next song on the steering wheel control seems to work well, was briefly tested in the workshop.

Anyway, here is the description "Not suitable for RD4 Continental". On the packaging of the device is nothing and my Continental RD4 Radio in Citroen C4 it works, so I think that the message might be wrong.