newsupernova/vendor/magento/module-quote/etc/adminhtml/di.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Quote\Model\ValidationRules\QuoteValidationComposite">
        <arguments>
            <argument name="validationRules" xsi:type="array">
                <item name="ShippingAddressValidationRule" xsi:type="object">Magento\Quote\Model\ValidationRules\ShippingAddressValidationRule</item>
                <item name="AllowedCountryValidationRule" xsi:type="object">Magento\Quote\Model\ValidationRules\AllowedCountryValidationRule</item>
                <item name="ShippingMethodValidationRule" xsi:type="object">Magento\Quote\Model\ValidationRules\ShippingMethodValidationRule</item>
                <item name="BillingAddressValidationRule" xsi:type="object">Magento\Quote\Model\ValidationRules\BillingAddressValidationRule</item>
                <item name="PaymentMethodValidationRule" xsi:type="object">Magento\Quote\Model\ValidationRules\PaymentMethodValidationRule</item>
            </argument>
        </arguments>
    </type>
</config>