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

[Stadtverwaltung Schwarzenberg]

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?