website_sale_multi_add/views.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record id="product_template_extension_form_view" model="ir.ui.view">
            <field name="name">product.template.extension.form.view</field>
            <field name="model">product.template</field>
            <field name="inherit_id" ref="product.product_template_only_form_view"/>
            <field name="arch" type="xml">
                <xpath expr="//field[@name='website_sequence']" position="after">
                    <field name="sale_on_website"/>
                </xpath>
            </field>
        </record>
    </data>
</openerp>