[Zope] how to clone an instance of a class into another location?

I tried to add a method (cloneInstance) to my class (myClass) that clones the instance (myInstance) into another folder. I called the method with the link host/path/to/myInstance/cloneInstance. The methods code: <dtml-call "manage_clone(this(),'clone',REQUEST)"> Which gave me the errormessage: The object copy_of_998-X does not support this operation ? Oh, really, doesn't it? So, how can I achieve what I need? And how do I clone an object into another location? Andy