code: def add_routing_area(self, routing_area, sync=True):
          
          LOGGER.debug("Location.add_routing_area")
          if not sync:
              self.routing_areas_2_add.append(routing_area)
          else:
              if self.id is not None and routing_area.id is None:
                  routing_area.save()
              if self.id is not None and routing_area.id is not None:
                  params = {
                      'id': self.id,
                      'routingareaID': routing_area.id
                  }
                  args = {'http_operation': 'GET', 'operation_path': 'update/routingareas/add', 'parameters': params}
                  response = LocationService.requester.call(args)
                  if response.rc != 0:
                      LOGGER.warning(
                          'Location.add_routing_area - Problem while updating location ' + self.name +
                          '. Reason: ' + str(response.response_content) + '-' + str(response.error_message) +
                          " (" + str(response.rc) + ")"
                      )
                  else:
                      self.routing_area_ids.append(routing_area.id)
                      routing_area.loc_ids.append(self.id)
              else:
                  LOGGER.warning(
                      'Location.add_routing_area - Problem while updating location ' + self.name +
                      '. Reason: routing area ' + routing_area.name + ' id is None or self.id is None.'
                  )
docs: add a routing area to this location.
          :param routing_area: the routing area to add on this location
          :param sync: If sync=True(default) synchronize with Ariane server. If sync=False,
          add the routing area object on list to be added on next save().
          :return: