eiru_sale_order/views/sale_order_search_box.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
	<data>
        <record id="views_eiru_sale_order" model="ir.ui.view">
            <field name="name">eiru.sale.order.view</field>
            <field name="model">sale.order</field>
            <field name="inherit_id" ref="sale.view_order_form"/>
            <field name="arch" type="xml">
                <field name="order_line" position="before">
                    <div class="product_search_box" attrs="{'invisible': [('state','not in',['draft','sent'])]}"></div>
                </field>
            </field>
        </record>
	</data>
</openerp>