code: private function saveLog($operIdWriteOff, $calcId)
      {
          /* log PvWriteOff operation itself */
          $log = new ELogOper();
          $log->setCalcId($calcId);
          $log->setOperId($operIdWriteOff);
          $this->daoLogOper->create($log);
      }
docs: Bind operations with calculation.
  
  @param int $operIdWriteOff
  @param int $calcId
  @throws \Exception