eiru_stock_picking/views/eiru_stock_picking_purchase.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
	<data>
        <record id="eiru_stock_picking_purchase_from" model="ir.ui.view">
            <field name="name">eiru.stock.picking.purchase.from</field>
            <field name="model">purchase.order</field>
            <field name="inherit_id" ref="purchase.purchase_order_form"/>
            <field name="arch" type="xml">
                <field name="state" position="before">
                    <div class="eiru-stock-picking-return" attrs="{'invisible': [('state','not in',['done','approved'])]}" ></div>
                </field>
            </field>
        </record>
	</data>
</openerp>