[Zope] Error Value: 'File' object has no attribute 'manage_fixupOwnershipAfterAdd'

[Roman Klesel]

Hello,

in a product I try to make a file object persistent with the _setObject() method.

However I get the error:
Error Value: 'File' object has no attribute 'manage_fixupOwnershipAfterAdd'

The following is the code where the error occurs:

cpu_load = self.getCpuLoad(id,location_sar,f_time,l_time)
system.cpu_load_file=File(data=cpu_load[0], contentType='text/plain')
self.tgt_folder[id]._setObject('cpu_load',system.cpu_load_file)

This is done in the __init__ method of the class. The class subclasses from Folder and SimpleItem.
self.tgt_folder[id] has been created a few lines above by:

self.tgt_folder[id]=Folder()
self._setObject(id,self.tgt_folder[id])

The container that holds self.tgt_folder[id] is a BTreesFolder2.

I know that the file Object is pretty simple, but how can one create and persist it if not with the _setObject() method?

Thanks in advance

Roman