web/web_tree_many2one_clickable/views/assets.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2015 Pedro M. Baeza <pedro.baeza@serviciosbaeza.com>
     Copyright 2019 Alexandre Díaz <alexandre.diaz@tecnativa.com>
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl). -->
<odoo>

    <template id="assets_backend" name="web_tree_many2one_clickable assets"
              inherit_id="web.assets_backend">
        <xpath expr="." position="inside">
            <link rel="stylesheet"
                  href="/web_tree_many2one_clickable/static/src/css/web_tree_many2one_clickable.scss" />
            <script type="text/javascript"
                    src="/web_tree_many2one_clickable/static/src/js/web_tree_many2one_clickable.js"/>
        </xpath>
    </template>

</odoo>