[Zope] Suggestions regarding two errors w/ZClass?

(Zope version: Zope 2.1.4 (binary release, python 1.5.2, solaris-2.6-sparc) ) I have a ZClass with base classes: ZObject, _ZClass_for_CatalogAware, _ZClass_for_Folder & ZObjectManager which allows me to create a tree of my ZClass instances. I would like to be able to cut and paste my ZClass instances, but when I attempt to paste : <!-- Error type: AttributeError Error value: aq_acquire -->