diff --git a/addons/sale/sale.py b/addons/sale/sale.py
index f51db0fa80d..49a96fe788a 100644
--- a/addons/sale/sale.py
+++ b/addons/sale/sale.py
@@ -1,7 +1,7 @@
 # -*- encoding: utf-8 -*-
 ##############################################################################
 #
-#    OpenERP, Open Source Management Solution	
+#    OpenERP, Open Source Management Solution
 #    Copyright (C) 2004-2008 Tiny SPRL (<http://tiny.be>). All Rights Reserved
 #    $Id$
 #
@@ -261,9 +261,9 @@ class sale_order(osv.osv):
                 unlink_ids.append(s['id'])
             else:
                 raise osv.except_osv(_('Invalid action !'), _('Cannot delete Sale Order(s) which are already confirmed !'))
-        return osv.osv.unlink(self, cr, uid, unlink_ids)        
-            
-    
+        return osv.osv.unlink(self, cr, uid, unlink_ids)
+
+
     def onchange_shop_id(self, cr, uid, ids, shop_id):
         v={}
         if shop_id:
@@ -296,6 +296,32 @@ class sale_order(osv.osv):
         payment_term = part.property_payment_term and part.property_payment_term.id or False
         return {'value':{'partner_invoice_id': addr['invoice'], 'partner_order_id':addr['contact'], 'partner_shipping_id':addr['delivery'], 'pricelist_id': pricelist, 'payment_term' : payment_term}}
 
+    def shipping_policy_change(self, cr, uid, ids, policy, context={}):
+        if not policy:
+            return {}
+        inv_qty = 'order'
+        if policy=='prepaid':
+            inv_qty = 'order'
+        elif policy=='picking':
+            inv_qty = 'procurement'
+        return {'value':{'invoice_quantity':inv_qty}}
+
+    def write(self, cr, uid, ids, vals, context=None):
+        if vals.has_key('order_policy'):
+            if vals['order_policy']=='prepaid':
+                vals.update({'invoice_quantity':'order'})
+            elif vals['order_policy']=='picking':
+                vals.update({'invoice_quantity':'procurement'})
+        return super(sale_order, self).write(cr, uid, ids, vals, context=context)
+
+    def create(self, cr, uid, vals, context={}):
+        if vals.has_key('order_policy'):
+            if vals['order_policy']=='prepaid':
+                vals.update({'invoice_quantity':'order'})
+            if vals['order_policy']=='picking':
+                vals.update({'invoice_quantity':'procurement'})
+        return super(sale_order, self).create(cr, uid, vals, context=context)
+
     def button_dummy(self, cr, uid, ids, context={}):
         return True
 
@@ -453,7 +479,7 @@ class sale_order(osv.osv):
     def test_state(self, cr, uid, ids, mode, *args):
         assert mode in ('finished', 'canceled'), _("invalid mode for test_state")
         finished = True
-        canceled = False 
+        canceled = False
         notcanceled = False
         write_done_ids = []
         write_cancel_ids = []
diff --git a/addons/sale/sale_view.xml b/addons/sale/sale_view.xml
index d362ad6d664..bbdc61d83a1 100644
--- a/addons/sale/sale_view.xml
+++ b/addons/sale/sale_view.xml
@@ -202,9 +202,9 @@
                             <field groups="base.group_extended" name="incoterm"/>
                             <field groups="base.group_extended" name="picking_policy" required="True"/>
                             <field name="user_id"/>
-                            <field name="order_policy"/>
+                            <field name="order_policy" on_change="shipping_policy_change(order_policy)"/>
                             <field groups="base.group_extended" name="origin"/>
-                            <field groups="base.group_extended" name="invoice_quantity" attrs="{'readonly':[('order_policy','=','prepaid')]}"/>
+                            <field groups="base.group_extended" name="invoice_quantity" attrs="{'readonly':[('order_policy','=','prepaid'),('order_policy','=','picking')]}"/>
                             <field name="payment_term"/>
                             <separator colspan="4" string="Notes"/>
                             <field colspan="4" name="note" nolabel="1"/>