BMW E39 520 - Rattle/knock - Harry Pearce

Hello,

I know the above subject is a very general but i am hoping someone out there might have some idea of what is causing it as its driving me a bit mad in an otherwise lovely car. Basically its a noise coming from the rear passenger door. There are no speakers there and no air bags. Sounds like a rattle/knocking noise. All suspension is fine it sounds like its coming from the lock area although have not had the door card off yet. It only happens going over some bumps not all and seems to stop when driving with the door open although have not being able to test this for any major distance for obvisous.

If anyone has any ideas of how to resolve it or what it might be it would really help

Thanks