[Zope] Next try at user auth and role creation

Hi, sofar I solved the creation process of user accounts. This was quite easy after I read the code for this. But now I have problems adding new roles via a specialized interface. I setup tghe REQUEST object correctly, then I call manage_defined_roles and I get various errors. Is their any method at all to create Roles besides the management interface of Zope or via External Methods? Setting local roles is easy, but I can get the role added to the system at all. Any help appreciated. Thanks a lot. Bye, Oliver