Common/EventListener/AbstractAdjustmentListener.php
protected function getItemFromAdjustment(Model\SaleItemAdjustmentInterface $adjustment)
    {
        if (null !== $item = $adjustment->getItem()) {
            return $item;
        }

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

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

        return null;
    }
protected function getItemFromAdjustment(Model\SaleItemAdjustmentInterface $adjustment)
    {
        if (null !== $item = $adjustment->getItem()) {
            return $item;
        }

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

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

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

@param Model\SaleItemAdjustmentInterface $adjustment

@return Model\SaleItemInterface|null