[Zope] ZClass authorization problem (You are not authorized to access manage_changeProperties)

I have created a new ZClass which contains a dtml method that first clones an object and then edits it's properties: <dtml-with manage_clone(News, REQUEST['new_id'], REQUEST)"> <dtml-call manage_changeProperties( title=REQUEST['new_title'], blah blah blah, )"> </dtml-with> When I fill out the 'add' form and try to create a new instance I am presented with the error message (as a user with a manager role): You are not authorized to access manage_changeProperties I am able to successfully create an instance if I am the superuser. How do I fix this?? Brad