eiru_product_sale_history/views/product_view.xml

<?xml version='1.0' encoding="utf-8"?>
<openerp>
    <data>
        <!-- Product View -->
        <record id="product_normal_form_view_sale_history" model="ir.ui.view">
            <field name="name">product.product.form</field>
            <field name="model">product.product</field>
            <field name="inherit_id" ref="product.product_normal_form_view"/>
            <field name="arch" type="xml">
                <xpath expr="//notebook/page[@string='Sales']" position="after">
                    <page name="cost" string="Historial de Ventas">
                        <field name="sale_line_ids"/>
                    </page>
                </xpath>
            </field>
        </record>

    </data>
</openerp>