Common/EventListener/AbstractAdjustmentListener.php
protected function getSaleFromAdjustment(Model\SaleAdjustmentInterface $adjustment)
    {
        if (null !== $sale = $adjustment->getSale()) {
            return $sale;
        }

        $cs = $this->persistenceHelper->getChangeSet($adjustment, $this->getSalePropertyPath());

        if (!empty($cs)) {
            return $cs[0];
        }

        return null;
    }
protected function getSaleFromAdjustment(Model\SaleAdjustmentInterface $adjustment)
    {
        if (null !== $sale = $adjustment->getSale()) {
            return $sale;
        }

        $cs = $this->persistenceHelper->getChangeSet($adjustment, $this->getSalePropertyPath());

        if (!empty($cs)) {
            return $cs[0];
        }

        return null;
    }
Returns the sale from the given sale adjustment (looking into change set).

@param Model\SaleAdjustmentInterface $adjustment

@return Model\SaleInterface|null