[Zope] Copy/Paste from DTML w/ Proxy Roles

Hi there! I'm trying to copy a folder to another folder using a DTML-Method. The Problem is that this Method has to be run by Anonymous so I thought I might give it "Manager" as a proxy-role. But this does not work. Every time I call <dtml-call "manage_pasteObjects(manage_copyObjects(ids=['defaultFolder']))"> I get a security exception! What the ?(&" am I doing wrong?