[Zope] calling getOwner on an ExtFile instance raises an Unauthorized ex ception

[Palermo, Tom]

All,
 
Does anyone know why calling getOwner() on an instance of ExtFile raises an
unauthorized exception?
    Error Type: Unauthorized    
    Error Value: You are not allowed to access 'getOwner' in this context

ExtFile imports SimpleItem which, in turn, imports AccessControl.Owner
 
Here's the code from ExtFile:
from OFS.SimpleItem import SimpleItem
 
Here's the code from SimpleItem:
import AccessControl.Role, AccessControl.Owned, App.Common
 
I've got some other custom objects in my application which import SimpleItem
and I am able to call getOwner() on them no problem.
 
Thanks,
Tom
 
 
 
 
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