diff --git a/addons/sale_layout/models/sale_layout.py b/addons/sale_layout/models/sale_layout.py
index 54298bdff59..ed42fabb991 100644
--- a/addons/sale_layout/models/sale_layout.py
+++ b/addons/sale_layout/models/sale_layout.py
@@ -40,7 +40,7 @@ def grouplines(self, ordered_lines, sortkey):
 
 class SaleLayoutCategory(osv.Model):
     _name = 'sale_layout.category'
-    _order = 'sequence'
+    _order = 'sequence, id'
     _columns = {
         'name': fields.char('Name', required=True),
         'sequence': fields.integer('Sequence', required=True),
@@ -121,7 +121,7 @@ class SaleOrderLine(osv.Model):
         'categ_sequence': 0
     }
 
-    _order = 'order_id, categ_sequence, sequence, id'
+    _order = 'order_id, categ_sequence, sale_layout_cat_id, sequence, id'
 
     def _prepare_order_line_invoice_line(self, cr, uid, line, account_id=False, context=None):
         """Save the layout when converting to an invoice line."""