/**
  * Check for customizations of an order item to reference only known order items.
  *
  * @param IOrderItem
  * @param IOrderItemIterable
  * @return self
  */
 protected function validateOrderItemCustomizations(IOrderItem $orderItem, IOrderItemIterable $orderItems)
 {
     $customizations = $orderItem->getCustomizations();
     foreach ($customizations as $customization) {
         $item = $customization->getCustomizedItem();
         $this->validateOptionalPayloadReference($item, 'customized item', $orderItems, $item);
     }
     return $this;
 }