web/web_switch_company_warning/view/view.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>
        <template id="assets_backend" name="web_switch_company_warning assets" inherit_id="web.assets_backend">
            <xpath expr="." position="inside">
                <script type="text/javascript" src="/web_switch_company_warning/static/src/js/switch_company_warning.js"></script>
            </xpath>
        </template>
    </data>
</openerp>