diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index 3d909c1085e..2a0be38b773 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -223,9 +223,16 @@ class purchase_order(osv.osv):
         ('name_uniq', 'unique(name, company_id)', 'Order Reference must be unique per Company!'),
     ]
     _name = "purchase.order"
+    _inherit = "mail.thread"
     _description = "Purchase Order"
     _order = "name desc"
-
+    
+    def create(self, cr, uid, vals, context=None):
+        order =  super(purchase_order, self).create(cr, uid, vals, context=context)
+        if order:
+            self.create_notificate(cr, uid, [order], context=context)
+        return order
+    
     def unlink(self, cr, uid, ids, context=None):
         purchase_orders = self.read(cr, uid, ids, ['state'], context=context)
         unlink_ids = []
@@ -292,6 +299,7 @@ class purchase_order(osv.osv):
         self.pool.get('purchase.order.line').action_confirm(cr, uid, todo, context)
         for id in ids:
             self.write(cr, uid, [id], {'state' : 'confirmed', 'validator' : uid})
+        self.confirm_notificate(cr, uid, ids, context)
         return True
 
     def _prepare_inv_line(self, cr, uid, account_id, order_line, context=None):
@@ -393,8 +401,15 @@ class purchase_order(osv.osv):
             # Link this new invoice to related purchase order
             order.write({'invoice_ids': [(4, inv_id)]}, context=context)
             res = inv_id
+        if res:
+            self.invoice_notificate(cr, uid, ids, res, context)
         return res
-
+    
+    def invoice_done(self, cr, uid, ids, context=None):
+        self.write(cr, uid, ids, {'state':'approved'}, context=context)
+        self.invoice_paid_notificate(cr, uid, ids, context=context)
+        return True
+        
     def has_stockable_product(self,cr, uid, ids, *args):
         for order in self.browse(cr, uid, ids):
             for order_line in order.order_line:
@@ -497,7 +512,7 @@ class purchase_order(osv.osv):
         stock_move.force_assign(cr, uid, todo_moves)
         wf_service.trg_validate(uid, 'stock.picking', picking_id, 'button_confirm', cr)
         return [picking_id]
-
+    
     def action_picking_create(self,cr, uid, ids, context=None):
         picking_ids = []
         for order in self.browse(cr, uid, ids):
@@ -507,8 +522,15 @@ class purchase_order(osv.osv):
         # In case of multiple (split) pickings, we should return the ID of the critical one, i.e. the
         # one that should trigger the advancement of the purchase workflow.
         # By default we will consider the first one as most important, but this behavior can be overridden.
+        if picking_ids:
+            self.shipment_notificate(cr, uid, ids, picking_ids[0], context=context)
         return picking_ids[0] if picking_ids else False
 
+    def picking_done(self, cr, uid, ids, context=None):
+        self.write(cr, uid, ids, {'shipped':1,'state':'approved'}, context=context)
+        self.shipment_done_notificate(cr, uid, ids, context=context)
+        return True
+
     def copy(self, cr, uid, id, default=None, context=None):
         if not default:
             default = {}
@@ -633,6 +655,52 @@ class purchase_order(osv.osv):
                 wf_service.trg_redirect(uid, 'purchase.order', old_id, neworder_id, cr)
                 wf_service.trg_validate(uid, 'purchase.order', old_id, 'purchase_cancel', cr)
         return orders_info
+        
+    # -----------------------------
+    # OpenChatter and notifications
+    # -----------------------------
+    def create_notificate(self, cr, uid, ids, context=None):
+        self.message_append_note(cr, uid, ids, _('System notification'),
+                        _("""Request for quotation <b>created</b>."""),
+                            type='notification', context=context)
+
+    def confirm_notificate(self, cr, uid, ids, context=None):
+        for obj in self.browse(cr, uid, ids, context=context):
+            self.message_subscribe(cr, uid, ids, [obj.validator.id], context=context)
+            self.message_append_note(cr, uid, ids, _('System notification'),
+                        _("""Quotation <em>%s</em> <b>converted</b> to a Purchase Order of  %s %s.""")
+                        % (obj.partner_id.name, obj.amount_total, obj.pricelist_id.currency_id.symbol), type='notification', context=context)
+        
+    def shipment_notificate(self, cr, uid, ids, picking_id, context=None):
+        for order in self.browse(cr, uid, ids, context=context):
+            for picking in (pck for pck in order.picking_ids if pck.id == picking_id):
+                pck_date =  datetime.strptime(picking.min_date, '%Y-%m-%d %H:%M:%S').strftime('%m/%d/%Y')
+                self.message_append_note(cr, uid, ids, _('System notification'),
+                        _("""Shipment <em>%s</em> <b>scheduled</b> for %s.""")
+                        % (picking.name, pck_date), type='notification', context=context)
+    
+    def invoice_notificate(self, cr, uid, ids, invoice_id, context=None):
+        for order in self.browse(cr, uid, ids, context=context):
+            for invoice in (inv for inv in order.invoice_ids if inv.id == invoice_id):
+                self.message_append_note(cr, uid, ids, _('System notification'),
+                        _("""Draft Invoice of %s %s <b>waiting for validation</b>.""")
+                        % (invoice.amount_total, invoice.currency_id.symbol), type='notification', context=context)
+    
+    def shipment_done_notificate(self, cr, uid, ids, context=None):
+        self.message_append_note(cr, uid, ids, _('System notification'),
+                    _("""Shipment <b>received</b>.""")
+                     ,type='notification', context=context)
+     
+    def invoice_paid_notificate(self, cr, uid, ids, context=None):
+        self.message_append_note(cr, uid, ids, _('System notification'),
+                    _("""Invoice <b>paid</b>.""")
+                     ,type='notification', context=context)
+    
+    def cancel_notificate(self, cr, uid, ids, context=None):
+        for obj in self.browse(cr, uid, ids, context=context):
+            self.message_append_note(cr, uid, ids, _('System notification'),
+                        _("""Purchase Order for <em>%s</em> <b>cancelled</b>.""")
+                        % (obj.partner_id.name), type='notification', context=context)
 
 purchase_order()
 
diff --git a/addons/purchase/purchase_view.xml b/addons/purchase/purchase_view.xml
index 1c936055aff..4e6ebc45c37 100644
--- a/addons/purchase/purchase_view.xml
+++ b/addons/purchase/purchase_view.xml
@@ -231,6 +231,7 @@
                             <field colspan="4" name="notes" nolabel="1"/>
                         </page>
                     </notebook>
+                   <field name="message_ids_social" colspan="4" widget="ThreadView" nolabel="1"/>
                 </form>
             </field>
         </record>
diff --git a/addons/purchase/purchase_workflow.xml b/addons/purchase/purchase_workflow.xml
index c978712c0a1..b26363a02f2 100644
--- a/addons/purchase/purchase_workflow.xml
+++ b/addons/purchase/purchase_workflow.xml
@@ -55,7 +55,7 @@
         <record id="act_invoice_done" model="workflow.activity">
             <field name="wkf_id" ref="purchase_order"/>
             <field name="name">invoice_done</field>
-            <field name="action">write({'state':'approved'})</field>
+            <field name="action">invoice_done()</field>
             <field name="kind">function</field>
         </record>
         <record id="act_invoice_end" model="workflow.activity">
@@ -72,7 +72,7 @@
         <record id="act_picking_done" model="workflow.activity">
             <field name="wkf_id" ref="purchase_order"/>
             <field name="name">picking_done</field>
-            <field name="action">write({'shipped':1,'state':'approved'})</field>
+            <field name="action">picking_done()</field>
             <field name="kind">function</field>
             <field name="signal_send">subflow.delivery_done</field>
         </record>