Odoo-Build/snippets/stock.report_delivery_document.header_packing.xml

<data inherit_id="stock.report_delivery_document" priority="60">
    <xpath expr="//table[@name='stock_move_table']/thead/tr/th[6]" position="after">
        <th id="position" class="text-end">
            <strong>Packing</strong>
            <th id="position" class="text-end">
            <strong>VE</strong>
            </th>
        </th>         
    </xpath>
    <xpath expr="//table[@name='stock_move_line_table']/thead/tr/th[6]" position="after">
        <th id="position" class="text-end">
            <strong>Packing</strong>
        </th>
        <th id="position" class="text-end">
            <strong>VE</strong>
        </th>        
    </xpath>
    <xpath expr="//table[@name='stock_backorder_table']/thead/tr/th[6]" position="after">
        <th id="position" class="text-end">
            <strong>Packing</strong>
        </th>
        <th id="position" class="text-end">
            <strong>VE</strong>
        </th>       
    </xpath>   
</data>