pos/pos_restricted_customer_list/views/assets_backend.xml

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