Lamella rollershutter error with somfy tahoma binding


I have 3 rollershutters and 1 lamella rollershutter controlled with a connexoon box.
When I try to control the lamella rollershutter with openHAB, it doesn’t work and I find this error in the log:

2019-07-12 09:54:36.622 [ERROR] [oma.handler.SomfyTahomaBridgeHandler] - Received error code: 400
2019-07-12 09:54:36.624 [WARN ] [oma.handler.SomfyTahomaBridgeHandler] - Apply command response: {"error":"Managed action group is invalid : No such command : down on device io://0816-2521-2819/11699561 (io:SimpleBioclimaticPergolaIOComponent)"}

The other 3 rollershutters work fine.
I use openHAB 2.4 and SomfyTahoma Binding

Can somebody help me?