[Zope] permission settings do not work like expected

Hi, I use zope 2.2.0 and I've got a problem with permission settings. When I try to limit the permissions for user to add only on type of objects to a folder then I get always two types back: - the one, which I like - and "Z Gadfly Database Connection" I used a local rule and discarded all "Acquire permission settings". The local rule has only one "ADD"-type, but like I said, I got gadfly to. Any idea? Jens