The SP / PU / GO request changes to the MPO or the MPO himself causes a change. The MPO reviews the change request. The MPO rejects the change of the measuring point by the SP / PU / GO or the MPO confirmes the request of the SP / PU / GO. The MPO performs the measuring point change. The MPO reports the implementation to the SP / PU / GO or notifies the SP / PU / GO about the failure of the changes .