diff --git a/addons/purchase_requisition/purchase_requisition.py b/addons/purchase_requisition/purchase_requisition.py
index 3bdc461917b..db05650354b 100644
--- a/addons/purchase_requisition/purchase_requisition.py
+++ b/addons/purchase_requisition/purchase_requisition.py
@@ -39,7 +39,7 @@ class purchase_requisition(osv.osv):
         'exclusive': fields.selection([('exclusive','Purchase Tender (exclusive)'),('multiple','Multiple Requisitions')],'Requisition Type', required=True, help="Purchase Tender (exclusive):On the confirmation of a purchase order, it cancels the remaining purchase order.Multiple Requisitions:It allows to have multiple purchase orders.On confirmation of a purchase order it does not cancel the remaining orders"""),
         'description': fields.text('Description'),
         'company_id': fields.many2one('res.company', 'Company', required=True),
-        'purchase_ids' : fields.one2many('purchase.order','requisition_id','Purchase Orders'),
+        'purchase_ids' : fields.one2many('purchase.order','requisition_id','Purchase Orders',states={'done': [('readonly', True)]}),
         'line_ids' : fields.one2many('purchase.requisition.line','requisition_id','Products to Purchase',states={'done': [('readonly', True)]}),
         'state': fields.selection([('draft','Draft'),('in_progress','In Progress'),('cancel','Cancelled'),('done','Done')], 'State', required=True)
     }
diff --git a/addons/purchase_requisition/purchase_requisition_view.xml b/addons/purchase_requisition/purchase_requisition_view.xml
index 93f4f111da0..76aa70aaf42 100644
--- a/addons/purchase_requisition/purchase_requisition_view.xml
+++ b/addons/purchase_requisition/purchase_requisition_view.xml
@@ -41,7 +41,6 @@
                     <field name="origin"/>
                     <field name="company_id" groups="base.group_multi_company" widget="selection"/>
                 </group>
-
                 <notebook colspan="4">
                     <page string="Products">
                         <field name="line_ids" colspan="4" nolabel="1">
@@ -83,7 +82,8 @@
                         <separator colspan="4" string=""/>
                          <group col="8" colspan="4">
                           <label colspan="6"  string=""/>
-                        <button name="%(action_purchase_requisition_partner)d" string="Requests for Quotation" type="action" icon="gtk-execute" />
+                        <button name="%(action_purchase_requisition_partner)d" string="Requests for Quotation" type="action" icon="gtk-execute" 
+                           attrs="{'readonly': [('state', '=', 'done')]}" />
                         </group>
                    </page>
                     <page string="Notes">