[Zope] Problems pasting into ZClass

[Itamar Shtull-Trauring]

Why does pasting into a CatalogAware ZClass (not an instance, the ZClass
itself) gives me:
	
Error Type: AttributeError
Error Value: REQUEST

Traceback (innermost last):
  File /itamar/Zope-2.0.1-linux2-x86/lib/python/ZPublisher/Publish.py, line
214, in publish_module
  File /itamar/Zope-2.0.1-linux2-x86/lib/python/ZPublisher/Publish.py, line
179, in publish
  File /itamar/Zope-2.0.1-linux2-x86/lib/python/Zope/__init__.py, line 201,
in zpublisher_exception_hook
    (Object: ElementWithAttributes)
  File /itamar/Zope-2.0.1-linux2-x86/lib/python/ZPublisher/Publish.py, line
165, in publish
  File /itamar/Zope-2.0.1-linux2-x86/lib/python/ZPublisher/mapply.py, line
160, in mapply
    (Object: manage_pasteObjects)
  File /itamar/Zope-2.0.1-linux2-x86/lib/python/ZPublisher/Publish.py, line
102, in call_object
    (Object: manage_pasteObjects)
  File /itamar/Zope-2.0.1-linux2-x86/lib/python/OFS/CopySupport.py, line
225, in manage_pasteObjects
    (Object: ElementWithAttributes)
  File /itamar/Zope-2.0.1-linux2-x86/lib/python/OFS/ObjectManager.py, line
264, in _delObject
    (Object: ElementWithAttributes)
  File
/itamar/Zope-2.0.1-linux2-x86/lib/python/Products/ZCatalog/CatalogAwareness.py,
line 129, in manage_beforeDelete
    (Object: CatalogAware)
  File
/itamar/Zope-2.0.1-linux2-x86/lib/python/Products/ZCatalog/CatalogAwareness.py,
line 186, in unindex_object
    (Object: CatalogAware)
  File
/itamar/Zope-2.0.1-linux2-x86/lib/python/Products/ZCatalog/CatalogAwareness.py,
line 156, in url
    (Object: CatalogAware)
  File /itamar/Zope-2.0.1-linux2-x86/lib/python/OFS/SimpleItem.py, line 316,
in absolute_url
    (Object: CatalogAware)
AttributeError: (see above)