If you have followed the above post for creating a new custom field you can create a new Group (German Document Portal Group) with just the View Document (Allowed) in the Authorisations, then add the new created group to the user(s) ‘Groups’ option.
Once that is done, just add the new Group to all of the German documents Custom Field (Portal Visibility Group) and the document should be visible to only the users that have been assigned the new group.
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