product_factory_ref_sale/factory_ref_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
       <record model="ir.ui.view" id="sale_order_factory_ref_view">
           <field name="name">sale.order.factory.ref.view</field>
           <field name="model">sale.order</field>
           <field name="inherit_id" ref="sale.view_order_form"/>
           <field name="arch" type="xml">
               <xpath expr="//tree/field[@name='product_id']" position="after">
                    <field name="product_factory_ref"/>
               </xpath>
               <xpath expr="//tree/field[@name='name']" position="replace">
                    <field name="name" invisible="1"/>
               </xpath>
               <xpath expr="//tree/field[@name='discount']" position="replace">
                    <field name="discount" invisible="1"/>
               </xpath>
               <field name="date_order" position="after">
                    <field name="create_uid" readonly="1"/>
               </field>
               <field name="client_order_ref" position="replace">
                    <field name="client_order_ref" invisible="1"/>
               </field>
               <field name="note" position="replace">
                    <field name="note" invisible="1"/>
               </field>
               <field name="message_ids" position="replace">
                    <field name="message_ids" invisible="1"/>
               </field>
               <field name="message_follower_ids" position="replace">
                    <field name="message_follower_ids" invisible="1"/>
               </field>
           </field>
       </record>
   </data>
</openerp>