product_view.xml

<?xml version="1.0"?>
<openerp>
    <data>
        <record model="ir.ui.view" id="product_product_tree_view_inherit">
            <field name="name">product.product.tree.inherit</field>
            <field name="model">product.product</field>
            <field name="type">tree</field>
            <field name="inherit_id" ref="product.product_product_tree_view"/>
            <field name="arch" type="xml">
                <field name="state" position="before">
                    <field name="partner_ref2"/>
                </field>
            </field>
        </record>
        <record model="ir.ui.view" id="product_normal_form_view_inherit">
            <field name="name">product.normal.form.inherit</field>
            <field name="model">product.product</field>
            <field name="type">form</field>
            <field name="inherit_id" ref="product.product_normal_form_view"/>
            <field name="arch" type="xml">
                <field name="seller_ids" position="after">
                    <field name="partner_ref2" select="2" invisible="1"/>
                </field>
            </field>
        </record>
    </data>
</openerp>