Unable to add PVR Timer using PVR.AddTimer

I tried out the new function to add PVR Timers but wasn’t able to add a new timer. I don’t know if it is a bug or if I am doing something wrong.

First I retrieving a list of broadcasts

Code:
http://127.0.0.1:8080/jsonrpc?request={"jsonrpc":"2.0","method":"PVR.GetBroadcasts","params":{"channelid":11,"limits":{"end":3,"start":0}},"id":29}

Which returns some broadcasts

Code:
{
    "broadcasts": [
        {
            "broadcastid": 217163,
            "label": "La meilleure boulangerie de France"
        },
        {
            "broadcastid": 217165,
            "label": "Chasseurs d'appart'"
        },
        {
            "broadcastid": 217167,
            "label": "Meteo"
        }
    ],
    "limits": {
        "end": 3,
        "start": 0,
        "total": 61
    }
}

Then I tried to add a timer using a broadcast id

Code:
http://127.0.0.1:8080/jsonrpc?request={"jsonrpc":"2.0","method":"PVR.AddTimer","params":{"broadcastid":217163},"id":33}

It returns an error message

Code:
{
    "code": -32602,
    "message": "Invalid params."
}

I tested using Kodi 17.0-BETA3 from the Ubuntu ppa and as PVR backend I am using tvheadend.