/**
  * Subtract qtys of quote item products after multishipping checkout
  *
  * @param EventObserver $observer
  * @return $this
  */
 public function execute(EventObserver $observer)
 {
     $quote = $observer->getEvent()->getQuote();
     if (!$quote->getInventoryProcessed()) {
         $this->subtractQuoteInventoryObserver->execute($observer);
         $this->reindexQuoteInventoryObserver->execute($observer);
     }
     return $this;
 }