eiru_sale_machine/views/mrp_production.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
<data>

    <record id="mrp_production_machine_form_view" model="ir.ui.view">
        <field name="name">MRP con Máquina</field>
        <field name="model">mrp.production</field>
        <field name="inherit_id" ref="mrp.mrp_production_form_view" />
        <field name="arch" type="xml">
            <field name="date_planned" position="after">
                <field name="mrp_machine_id" string="Máquina"/>
                <field name="sale_id" string="Ref. Venta"/>
                <field name="sale_line_id" invisible="1"/>
                <field name="partner_id" string="Cliente"/>
            </field>
        </field>
    </record>

    <record id="mrp_production_machine_tree_view" model="ir.ui.view">
        <field name="name">MRP con Máquina</field>
        <field name="model">mrp.production</field>
        <field name="inherit_id" ref="mrp.mrp_production_tree_view"/>
        <field name="arch" type="xml">
            <field name="date_planned" position="after">
                <field name="mrp_machine_id" string="Máquina"/>
                <field name="sale_id" string="Ref. Venta"/>
                <field name="sale_line_id" invisible="1"/>
                <field name="partner_id" string="Cliente"/>
            </field>
        </field>
    </record>

    <record id="mrp_production_machine_info_search_view" model="ir.ui.view">
        <field name="name">MRP Production search with Machine</field>
        <field name="model">mrp.production</field>
        <field name="inherit_id" ref="mrp.view_mrp_production_filter" />
        <field name="arch" type="xml">
            <field name="product_id" position="after">
                <field name="partner_id" string="Cliente"/>
                <field name="sale_id" string="Ref. Venta"/>
                <field name="mrp_machine_id" />
            </field>
            <group position="inside">
                <filter string="Cliente" icon="terp-accessories-archiver"
                    domain="[]" context="{'group_by':'partner_id'}" />
                <filter string="Ref. Venta" icon="terp-accessories-archiver"
                    domain="[]" context="{'group_by':'sale_id'}" />
                <filter string="Máquina" icon="terp-accessories-archiver"
                    domain="[]" context="{'group_by':'mrp_machine_id'}" />
            </group>
        </field>
    </record>

</data>
</openerp>