Discount::loadOrderData

protected function loadOrderData()
{
	$result = parent::loadOrderData();
	if (!$result->isSuccess())
		return $result;

	if (!$this->isShipmentExists())
	{
		$this->shipmentIds = [];
		$shipmentResult = $this->loadShipment();
		if (!$shipmentResult->isSuccess())
		{
			$result->addErrors($shipmentResult->getErrors());
			return $result;
		}
		unset($shipmentResult);
	}
	$this->fillShipmentData();

	return $result;
}