code: protected function scheduleSubjectStockUnitChangeEvent(StockUnitInterface $stockUnit)
      {
          $this->persistenceHelper->scheduleEvent(
              $this->getSubjectStockUnitChangeEventName(),
              new SubjectStockUnitEvent($stockUnit)
          );
      }
docs: Dispatches the subject's "stock unit change" event.
  
  @param StockUnitInterface $stockUnit