Common/EventListener/AbstractSaleListener.php
protected function updateVatData(SaleInterface $sale)
    {
        $changed = false;

        if (null !== $customer = $sale->getCustomer()) {
            if (0 == strlen($sale->getVatNumber()) && 0 < strlen($customer->getVatNumber())) {
                $sale->setVatNumber($customer->getVatNumber());
                $changed = true;
            }
            if (empty($sale->getVatDetails()) && !empty($customer->getVatDetails())) {
                $sale->setVatDetails($customer->getVatDetails());
                $changed = true;
            }
            if (!$sale->isVatValid() && $customer->isVatValid()) {
                $sale->setVatValid(true);
                $changed = true;
            }
        }

        return $changed;
    }
protected function updateVatData(SaleInterface $sale)
    {
        $changed = false;

        if (null !== $customer = $sale->getCustomer()) {
            if (0 == strlen($sale->getVatNumber()) && 0 < strlen($customer->getVatNumber())) {
                $sale->setVatNumber($customer->getVatNumber());
                $changed = true;
            }
            if (empty($sale->getVatDetails()) && !empty($customer->getVatDetails())) {
                $sale->setVatDetails($customer->getVatDetails());
                $changed = true;
            }
            if (!$sale->isVatValid() && $customer->isVatValid()) {
                $sale->setVatValid(true);
                $changed = true;
            }
        }

        return $changed;
    }
Updates the vat data.

@param SaleInterface $sale

@return bool Whether the sale has been changed.