Once again thanks to you, but I can't figure out why cloning it's not possible. The object is a simple zclass with the baseclasses ->ZObject, ZObjectManager<- Nothing special. I know that cloning a catalogaware zclass it's not working but object-manager?? That's the complete traceback: ------> Traceback (innermost last): File C:\Zop\lib\python\ZPublisher\Publish.py, line 222, in publish_module File C:\Zop\lib\python\ZPublisher\Publish.py, line 187, in publish File C:\Zop\lib\python\Zope\__init__.py, line 221, in zpublisher_exception_hook (Object: ElementWithAttributes) File C:\Zop\lib\python\ZPublisher\Publish.py, line 171, in publish File C:\Zop\lib\python\ZPublisher\mapply.py, line 160, in mapply (Object: NewsPruefer) File C:\Zop\lib\python\ZPublisher\Publish.py, line 112, in call_object (Object: NewsPruefer) File C:\Zop\lib\python\OFS\DTMLMethod.py, line 167, in __call__ (Object: NewsPruefer) File C:\Zop\lib\python\DocumentTemplate\DT_String.py, line 502, in __call__ (Object: NewsPruefer) File C:\Zop\lib\python\DocumentTemplate\DT_In.py, line 607, in renderwob (Object: objectValues(['news'])) File C:\Zop\lib\python\DocumentTemplate\DT_Let.py, line 147, in render (Object: x="_.getitem('sequence-item')") File C:\Zop\lib\python\DocumentTemplate\DT_Util.py, line 337, in eval (Object: manage_clone(x,'versuch',REQUEST)) (Info: REQUEST) File <string>, line 0, in ? File C:\Zop\lib\python\OFS\CopySupport.py, line 321, in manage_clone (Object: holle) File C:\Zop\lib\python\OFS\CopySupport.py, line 402, in _verifyObjectPaste (Object: holle) Copy Error: (see above) Thanks again!