[Zope] wrapped object

[Sven Hohage]

Hallo,
while adding ZClass instances by form I get the following traceback:
I don't know what's a wrapped object??
And where the problem is.
       Thanks
-->>>>>>>
  Zope Error
Zope has encountered an error while publishing this resource.

Error Type: ValueError
Error Value: Invalid property value: wrapped object



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Traceback (innermost last):
  File C:\Zopppaaa\lib\python\ZPublisher\Publish.py, line 222, in
publish_module
  File C:\Zopppaaa\lib\python\ZPublisher\Publish.py, line 187, in
publish
  File C:\Zopppaaa\lib\python\Zope\__init__.py, line 221, in
zpublisher_exception_hook
    (Object: ElementWithAttributes)
  File C:\Zopppaaa\lib\python\ZPublisher\Publish.py, line 171, in
publish
  File C:\Zopppaaa\lib\python\ZPublisher\mapply.py, line 160, in mapply
    (Object: testskript)
  File C:\Zopppaaa\lib\python\ZPublisher\Publish.py, line 112, in
call_object
    (Object: testskript)
  File C:\Zopppaaa\lib\python\OFS\DTMLMethod.py, line 167, in __call__
    (Object: testskript)
  File C:\Zopppaaa\lib\python\DocumentTemplate\DT_String.py, line 502,
in __call__
    (Object: testskript)
  File C:\Zopppaaa\lib\python\DocumentTemplate\DT_With.py, line 146, in
render
    (Object: manage_addProduct['DBank'])
  File C:\Zopppaaa\lib\python\DocumentTemplate\DT_Util.py, line 337, in
eval
    (Object: eingang_DB_add (_.None, _, NoRedir=1))
    (Info: eingang_DB_add)
  File <string>, line 0, in ?
  File C:\Zopppaaa\lib\python\OFS\DTMLMethod.py, line 163, in __call__
    (Object: eingang_DB_add)
  File C:\Zopppaaa\lib\python\DocumentTemplate\DT_String.py, line 502,
in __call__
    (Object: eingang_DB_add)
  File C:\Zopppaaa\lib\python\DocumentTemplate\DT_With.py, line 146, in
render
    (Object: eingang_DB.createInObjectManager(REQUEST['id'], REQUEST))
  File C:\Zopppaaa\lib\python\DocumentTemplate\DT_Util.py, line 337, in
eval
    (Object:
propertysheets.eingangs_info.manage_editProperties(REQUEST))
    (Info: REQUEST)
  File <string>, line 0, in ?
  File C:\Zopppaaa\lib\python\OFS\PropertySheets.py, line 456, in
manage_editProperties
    (Object: Traversable)
  File C:\Zopppaaa\lib\python\OFS\PropertySheets.py, line 255, in
_updateProperty
    (Object: Traversable)
  File C:\Zopppaaa\lib\python\OFS\PropertySheets.py, line 208, in
_wrapperCheck
    (Object: Traversable)
ValueError: (see above)