Permission problem in validation

Hi all,
 
I'm encountering a permission problem when trying to access a CPS document for validation.
I'm using CPS 3.4.2 on Zope 2.9.4 with a custom product (based on the vogon poetry)
 
We have two custom documents (only these are allowed, and not the original CPS ones) and their custom workflows
These documents are submitted from the user workspaces to the 'sections' publication space
Administrators can publish directly, but the contributor-submitted documents need validation and are in the 'pending' state until then.
 
The problem arises when a validator tries to view a document to accept/reject it:
the link visible in the list is [..blah...]/sections/00000009768/view_stats
following it prompts the user for a password (browser-style, not the login_form) and failure to provide credentials is worth a nice big 'Unauthorized'...
 
Error Type:	 Unauthorized	
Error Value: You are not allowed to access 'manage_changeProperties' in this context
Traceback:	 Traceback (innermost last):


*	Module ZPublisher.Publish, line 115, in publish 
*	Module ZPublisher.mapply, line 88, in mapply 
*	Module ZPublisher.Publish, line 41, in call_object 
*	Module Products.CMFCore.FSPythonScript, line 108, in __call__ 
*	Module Shared.DC.Scripts.Bindings, line 311, in __call__ 
*	Module Shared.DC.Scripts.Bindings, line 348, in _bindAndExec 
*	Module Products.CMFCore.FSPythonScript, line 164, in _exec 
*	Module None, line 10, in view_stats
	<FSPythonScript at /DBR/view_stats used for /DBR/sections/00000009768>
	Line 10

Unauthorized: You are not allowed to access 'manage_changeProperties' in this context
I'm not sure where this comes from, since the user has been added to the adequate group (in theory)
The manager can (obviously...) access this page with no problems
Any ideas?
Jonathan
 


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