Deleting Waypoint

I have a problem with one waypoint i can not delete. It looks like a waypoint with my actual location, because it is with my surname, but the location is totally wrong.

 I can not manage this individual waypoint. The buttons have no function. All other waypoints in my collection can be managed.

Are anybody who can help me with a workflow? I tried everything I know so far, but I find no way to delete this waypoint.

Thanks, 

Werner