product_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record id="product_normal_form_view_multi_ean13" model="ir.ui.view">
            <field name="name">product.normal.form.multi.ean13</field>
            <field name="model">product.product</field>
            <field name="inherit_id" ref="product.product_normal_form_view" />
            <field name="arch" type="xml">
                <xpath expr="/form//div[@name='ean']/preceding-sibling::label[1]" position="replace">
                </xpath>
                <xpath expr="/form//div[@name='ean']" position="replace">
                    <field name="ean13_ids">
                        <form string="EAN13">
                            <field name="name"/>
                        </form>
                        <tree string="EAN13">
                            <field name="sequence" widget="handle"/>
                            <field name="name"/>
                        </tree>
                    </field>
                    <field name="ean13" invisible="1"/>
                </xpath>
            </field>
        </record>
    </data>
</openerp>