purchase_filter/view/purchase_view.xml

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

        <record id="view_purchase_orderfilter_search1" model="ir.ui.view">
            <field name="name">purchase.order.filter.search1</field>
            <field name="model">purchase.order</field>
            <field name="inherit_id" ref="purchase.view_purchase_order_filter" />
            <field name="arch" type="xml">
              <search>

                  <separator/>

                  <filter string="Este año" name="year" domain="[('date_order','&lt;=', time.strftime('%%Y-12-31')),('date_order','&gt;=',time.strftime('%%Y-01-01'))]"/>
                  <filter string="Año pasado " domain="[('date_order','&gt;=',(context_today()-relativedelta(years=1)).strftime('%%Y-01-01')),('date_order','&lt;=', time.strftime('%%Y-01-01'))]"/>
                  <filter string="Mes actual" domain="[('date_order','&lt;',(context_today()+relativedelta(months=1)).strftime('%%Y-%%m-01')), ('date_order','&gt;=',time.strftime('%%Y-%%m-01'))]"/>
                  <filter string="Mes pasado" domain="[('date_order','&gt;=',(context_today()-relativedelta(months=1)).strftime('%%Y-%%m-01')),('date_order','&lt;',time.strftime('%%Y-%%m-01'))]"/>
                  <filter string="Semana anterior" domain="[('date_order', '&gt;=', ((context_today()+relativedelta(weeks=-2, days=1, weekday=0)).strftime('%%Y-%%m-%%d'))),('date_order', '&lt;=', ((context_today()+relativedelta(weeks=-1, weekday=6)).strftime('%%Y-%%m-%%d')))]"/>
                  <filter string="Esta semana" domain="[('date_order', '&gt;=', ((context_today()+relativedelta(weeks=-1, days=1, weekday=0)).strftime('%%Y-%%m-%%d'))),('date_order', '&lt;=', ((context_today()+relativedelta(weeks=0, weekday=6)).strftime('%%Y-%%m-%%d')))]"/>
                  <filter string="Hoy" domain="[('date_order', '&gt;=', datetime.datetime.now().strftime('%Y-%m-%d 00:00:00')),('date_order', '&lt;=',datetime.datetime.now().strftime('%Y-%m-%d 23:23:59'))]"/>
                  <filter string=" Ayer " domain="[('date_order','&lt;=', (datetime.date.today()-relativedelta(days=1)).strftime('%%Y-%%m-%%d')),('date_order','&gt;=',(datetime.date.today()-relativedelta(days=1)).strftime('%%Y-%%m-%%d'))]"/>
                  <filter string="Guarani" name="currency_id" domain="[('currency_id','=','PYG')]"/>
                  <filter string="Dolar" name="currency_id" domain="[('currency_id','=','USD')]"/>
                  <separator/>
                  <group string="Agrupar por">
                      <filter string="Por dia" context="{'group_by':'date_order:day'}"/>
                  </group>
               </search>
            </field>
        </record>

    </data>
</openerp>