eiru_kitchen_ticket/views/pos_template.xml

<openerp>
    <data>
        <template id="pos_kitchen_ticket_assets_backend" name="pos_kitchen_ticket_assets_backend" inherit_id="point_of_sale.assets_backend">
            <xpath expr="." position="inside">
                <script src="/eiru_kitchen_ticket/static/src/js/main.js"
                        type="text/javascript"></script>
            </xpath>
        </template> 
    </data>
</openerp>