ENTER key on Venu 2

I have an app that provides an important function via the ENTER key. However, I am now getting feedback from Venu 2 users, that this key (on the Venu the upper right key, A key) has no effect. On other watches, especially on the classic Venu and on the simulator there are no problems.

My code in the BehaviorDelegate

   function onKey(evt) 
    {
        if( evt.getKey() == KEY_ENTER )
        {
        	// call my function ...
            return true;
        }
        return false;
    }


Does anyone have any idea where the problem is and how to solve it?