partner-contact/partner_credit_limit_pos/views/templates.xml

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

        <template id="pos_assets_backend" name="POS Assets" inherit_id="point_of_sale.assets_backend">
            <xpath expr="." position="inside">
                <script type="text/javascript" src="/partner_credit_limit_pos/static/src/js/main.js"></script>
            </xpath>
        </template>

    </data>
</openerp>