server-tools/excel_import_export_demo/report_action/sale_order/report.xml

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>

    <report id='action_report_saleorder_excel'
            string='Quotation / Order (.xlsx)'
            model='sale.order'
            name='sale_order_form.xlsx'
            file='sale_order'
            print_report_name="(object.state in ('draft', 'sent') and 'Quotation - %s' % (object.name)) or 'Order - %s' % (object.name)"
            report_type='excel'
    />

</odoo>