eiru_mrp_cost/views/mrp_view.xml

<?xml version="1.0"?>
<openerp>
    <data>
        <record id="mrp_production_form_view" model="ir.ui.view">
            <field name="name">eiru.mrp.production.form</field>
            <field name="model">mrp.production</field>
            <field name="type">form</field>
            <field name="inherit_id" ref="mrp.mrp_production_form_view"/>
            <field name="arch" type="xml">
                <field name="date_planned" position="after">
                    <field name="prod_price_unit"/>
                    <field name="product_price"/>
                </field>
            </field>
        </record>
        <record id="mrp_eiru_tree_parent_view" model="ir.ui.view">
            <field name="name">mrp.eiru.bom.tree</field>
            <field name="model">mrp.production</field>
            <field name="inherit_id" ref="mrp.mrp_production_tree_view"/>
            <field name="arch" type="xml">

                    <xpath expr="//tree/field[@name='origin']" position="after">
                        <field name="prod_price_unit"/>
                        <field name="product_price" sum="Total Producción"/>
                    </xpath>

            </field>
        </record>
    </data>

</openerp>