code: def invertible_query?(obj, attribute)
        super and not (hook_proxy_attribute?(obj, attribute) or
          (CaTissue::CollectionProtocolEvent === obj and attribute == :specimen_requirements))
      end
docs: @quirk caCORE Override +CaRuby::Database::Reader.invertible_query?+ to enable the Bug #147 work
     around in {#query_object}. Invertible queries are performed to work around Bug #79. However, this
     work-around induces Bug #147, so we disable the Bug #79 work-around here for the special case of
     a CPE in order to enable the Bug #147 work-around. And so it goes....
  
   @see CaRuby::Database#invertible_query?