Creditmemo.php

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<?php
namespace Magento\Sales\Model\ResourceModel\Order;

use Magento\Framework\App\ResourceConnection as AppResource;
use Magento\SalesSequence\Model\Manager;
use Magento\Sales\Model\ResourceModel\Attribute;
use Magento\Sales\Model\ResourceModel\EntityAbstract as SalesResource;
use Magento\Framework\Model\ResourceModel\Db\VersionControl\Snapshot;
use Magento\Sales\Model\Spi\CreditmemoResourceInterface;

class Creditmemo extends SalesResource implements CreditmemoResourceInterface
{
    protected $_eventPrefix = 'sales_order_creditmemo_resource';

    protected function _construct()
    {
        $this->_init('sales_creditmemo', 'entity_id');
    }

    protected function _beforeSave(\Magento\Framework\Model\AbstractModel $object)
    {
        if (!$object->getOrderId() && $object->getOrder()) {
            $object->setOrderId($object->getOrder()->getId());
            $object->setBillingAddressId($object->getOrder()->getBillingAddress()->getId());
        }

        if (!$object->getInvoiceId() && $object->getInvoice()) {
            $object->setInvoiceId($object->getInvoice()->getId());
        }

        return parent::_beforeSave($object);
    }
}