code: public MonitoringPoint getRelatedMonitoringPoint( String pfafStetter ) {
          if (pfafStetter != null) {
              return pfafRelatedMonitoringPointsTable.get(pfafStetter);
          } else {
              Set<String> keySet = pfafRelatedMonitoringPointsTable.keySet();
              for( String key : keySet ) {
                  return pfafRelatedMonitoringPointsTable.get(key);
              }
              return null;
          }
      }
docs: Get the related monitoringpoint. If there are more than one, the pfafstetter number is used
  to chose.
  
  @param pfafStetter used to chose in the points table. Can be null, in which case the first
  found is taken (should be used only if there is only one point in the table)
  @return the related point