flectra/addons/account_invoicing/views/account_invoicing_templates.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
        <template id="assets_backend" name="account assets" inherit_id="web.assets_backend">
            <xpath expr="." position="inside">
                <script type="text/javascript" src="/account_invoicing/static/src/js/tour.js"></script>
            </xpath>
        </template>
</odoo>
[INIT] Inception of Flectra from Odoo Flectra is Forked from Odoo v11 commit : (https://github.com/odoo/odoo/commit/6135e82d735d5eb3af914f4a838468f6dc33e51d) 2018-01-16 06:58:15 +01:00			`<?xml version="1.0" encoding="utf-8"?>`
			`<odoo>`
			`<template id="assets_backend" name="account assets" inherit_id="web.assets_backend">`
			`<xpath expr="." position="inside">`
			`<script type="text/javascript" src="/account_invoicing/static/src/js/tour.js"></script>`
			`</xpath>`
			`</template>`
			`</odoo>`