diff --git a/addons/product/product.py b/addons/product/product.py
index 874680cb17d..4df455e7409 100644
--- a/addons/product/product.py
+++ b/addons/product/product.py
@@ -218,6 +218,8 @@ class product_category(osv.osv):
         'child_id': fields.one2many('product.category', 'parent_id', string='Child Categories'),
         'sequence': fields.integer('Sequence', select=True, help="Gives the sequence order when displaying a list of product categories."),
         'type': fields.selection([('view','View'), ('normal','Normal')], 'Category Type'),
+        'parent_left': fields.integer('Left Parent', select=1),
+        'parent_right': fields.integer('Right Parent', select=1),
     }
 
 
@@ -225,7 +227,11 @@ class product_category(osv.osv):
         'type' : lambda *a : 'normal',
     }
 
-    _order = "sequence, name"
+    _parent_name = "parent_id"
+    _parent_store = True
+    _parent_order = 'sequence, name'
+    _order = 'parent_left'
+    
     def _check_recursion(self, cr, uid, ids, context=None):
         level = 100
         while len(ids):