ShipmentItemStoreCollection::onItemModify

public function onItemModify(InternalsCollectableEntity $item, $name = null, $oldValue = null, $value = null)
{
	$result = new Result();

	if ($name == "QUANTITY")
	{
		$r = $this->checkAvailableQuantity($item);
		if (!$r->isSuccess())
		{
			return $result->addErrors($r->getErrors());
		}
	}

	return new Result();
}