cooperative-market/pos_keyboard/data.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>

        <template id="assets" inherit_id="point_of_sale.assets">
            <xpath expr="." position="inside">
                <script type="text/javascript" src="/pos_keyboard/static/src/js/pos.js"></script>
            </xpath>
        </template>
        
    </data>
</openerp>