diff --git a/addons/procurement/procurement.py b/addons/procurement/procurement.py
index 099d0a09194..42556905dc3 100644
--- a/addons/procurement/procurement.py
+++ b/addons/procurement/procurement.py
@@ -154,7 +154,7 @@ class procurement_order(osv.osv):
             else:
                 raise osv.except_osv(_('Invalid Action!'),
                         _('Cannot delete Procurement Order(s) which are in %s state.') % s['state'])
-        return osv.osv.unlink(self, cr, uid, unlink_ids, context=context)
+        return super(procurement_order, self).unlink(cr, uid, unlink_ids, context=context)
 
     def do_view_procurements(self, cr, uid, ids, context=None):
         '''
diff --git a/addons/sale/sale.py b/addons/sale/sale.py
index b4643fc6eb7..6cafd72510e 100644
--- a/addons/sale/sale.py
+++ b/addons/sale/sale.py
@@ -279,7 +279,7 @@ class sale_order(osv.osv):
             else:
                 raise osv.except_osv(_('Invalid Action!'), _('In order to delete a confirmed sales order, you must cancel it before!'))
 
-        return osv.osv.unlink(self, cr, uid, unlink_ids, context=context)
+        return super(sale_order, self).unlink(cr, uid, unlink_ids, context=context)
 
     def copy_quotation(self, cr, uid, ids, context=None):
         id = self.copy(cr, uid, ids[0], context=context)