manufacture/mrp_production_note/views/mrp_production_view.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>
        <record model="ir.ui.view" id="mrp_production_form_view">
            <field name="name">mrp.production.form</field>
            <field name="model">mrp.production</field>
            <field name="inherit_id" ref="mrp.mrp_production_form_view" />
            <field name="arch" type="xml">
                <notebook position="inside">
                    <page string="Notes">
                        <field name="notes" nolabel="1" />
                    </page>
                </notebook>
            </field>
        </record>
    </data>
</openerp>