<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <virtualType name="Magento\Sales\Model\ResourceModel\Order\Grid" type="Magento\Sales\Model\ResourceModel\Grid">
        <arguments>
            <argument name="columns" xsi:type="array">
                <item name="add_invoice" xsi:type="string">sales_order.add_invoice</item>
            </argument>
        </arguments>
    </virtualType>
    <type name="Magento\Checkout\Block\Checkout\LayoutProcessor">
        <plugin name="add-invoice-field" type="Dinhvan\AddInvoice\Model\Checkout\LayoutProcessorPlugin" sortOrder="10"/>
    </type>
</config>