private function addDiscountDetails(array &$details, Model\SaleAdjustmentInterface $discount)
    {
        $discountResult = $discount->getResult();

        $details['L_PAYMENTREQUEST_0_NAME' . $this->line] = $discount->getDesignation();
        $details['L_PAYMENTREQUEST_0_AMT' . $this->line] = '-' . $this->format($discountResult->getTotal());
        //$details['L_PAYMENTREQUEST_0_TAXAMT' . $this->line] = '-' . $this->format($discountResult->getTax());

        $this->line++;

        return -$discountResult->getTotal();
    }