Watch and Sensor permission (allow in manifest)

Hello
I wrote a watch for FR 235. I would like to show HeartRate from Sensor and my manifest.xml file is set to :

<iq:permissions>
<iq:uses-permission id="Sensor"/>
</iq:permissions>


but... when i run, i have the message "Permission Required" ?

I'm sure that Sensor is allow in watch (i tried with UserProfile for exemple it works)

What is wrong ?? :confused:
Thanks !