CreationQuantityValidator.php

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<?php
namespace Magento\Sales\Model\Order\Creditmemo\Item\Validation;

use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Sales\Api\Data\OrderInterface;
use Magento\Sales\Api\Data\OrderInterfaceFactory;
use Magento\Sales\Api\Data\OrderItemInterface;
use Magento\Sales\Api\OrderItemRepositoryInterface;
use Magento\Sales\Model\Order\Item;
use Magento\Sales\Model\ValidatorInterface;

class CreationQuantityValidator implements ValidatorInterface
{
    private $orderItemRepository;

    private $context;

    public function __construct(OrderItemRepositoryInterface $orderItemRepository, $context = null)
    {
        $this->orderItemRepository = $orderItemRepository;
        $this->context = $context;
    }

    public function validate($entity)
    {
        try {
            $orderItem = $this->orderItemRepository->get($entity->getOrderItemId());
            if (!$this->isItemPartOfContextOrder($orderItem)) {
                return [__('The creditmemo contains product item that is not part of the original order.')];
            }
        } catch (NoSuchEntityException $e) {
            return [__('The creditmemo contains product item that is not part of the original order.')];
        }

        if (!$this->isQtyAvailable($orderItem, $entity->getQty())) {
            return [__('The quantity to refund must not be greater than the unrefunded quantity.')];
        }

        return [];
    }

    private function isQtyAvailable(Item $orderItem, $qty)
    {
        return $qty <= $orderItem->getQtyToRefund() || $orderItem->isDummy();
    }

    private function isItemPartOfContextOrder(OrderItemInterface $orderItem)
    {
        return $this->context instanceof OrderInterface && $this->context->getEntityId() === $orderItem->getOrderId();
    }
}