diff --git a/addons/stock/stock.py b/addons/stock/stock.py
index 40f9fb38f5b..77e8d0123d1 100644
--- a/addons/stock/stock.py
+++ b/addons/stock/stock.py
@@ -600,8 +600,9 @@ class stock_production_lot(osv.osv):
 		'name': lambda x,y,z,c: x.pool.get('ir.sequence').get(y,z,'stock.lot.serial'),
 	}
 	_sql_constraints = [
-		('name_uniq', 'unique (name)', 'The serial must be unique !'),
+		('name_ref_uniq', 'unique (name, ref)', 'The serial/ref must be unique !'),
 	]
+
 stock_production_lot()
 
 class stock_production_lot_revision(osv.osv):
diff --git a/addons/stock/stock_sequence.xml b/addons/stock/stock_sequence.xml
index 6feee6dc1fe..a29be6e1063 100644
--- a/addons/stock/stock_sequence.xml
+++ b/addons/stock/stock_sequence.xml
@@ -41,6 +41,15 @@
 		<field name="name">Stock production lots</field>
 		<field name="code">stock.lot.serial</field>
 	</record>
+	<record model="ir.sequence" id="sequence_production_lots">
+		<field name="name">Stock production sequence</field>
+		<field name="code">stock.lot.serial</field>
+		<field name="prefix">1234567890</field>
+		<field name="padding">7</field>
+		<field name="number_next">1</field>
+		<field name="number_increment">1</field>
+	</record>
+
 	<record model="ir.sequence.type" id="sequence_type_tracking">
 		<field name="name">Stock Lot Tracking</field>
 		<field name="code">stock.lot.tracking</field>
diff --git a/addons/stock/wizard/wizard_track_line.py b/addons/stock/wizard/wizard_track_line.py
index 880cadf35f2..caf45e46e73 100644
--- a/addons/stock/wizard/wizard_track_line.py
+++ b/addons/stock/wizard/wizard_track_line.py
@@ -57,14 +57,17 @@ fields = {
 def _track_lines(self, cr, uid, data, context):
 	move_id = data['id']
 
-	prodlot_obj = pooler.get_pool(cr.dbname).get('stock.production.lot')
-	move_obj = pooler.get_pool(cr.dbname).get('stock.move')
-	sequence = pooler.get_pool(cr.dbname).get('ir.sequence').get(cr, uid, 'stock.lot.serial')
-	production_obj = pooler.get_pool(cr.dbname).get('mrp.production')
+	pool = pooler.get_pool(cr.dbname)
+	prodlot_obj = pool.get('stock.production.lot')
+	move_obj = pool.get('stock.move')
+	production_obj = pool.get('mrp.production')
+	ir_sequence_obj = pool.get('ir.sequence')
+
+	sequence = ir_sequence_obj.get(cr, uid, 'stock.lot.serial')
+	if not sequence:
+		raise wizard.except_wizard('Error!', 'No production sequence defined')
 	if data['form']['tracking_prefix']:
 		sequence=data['form']['tracking_prefix']+'/'+(sequence or '')
-	if not sequence:
-		raise wizard.except_wizard('Error !', 'No tracking prefix defined')
 
 	move = move_obj.browse(cr, uid, [move_id])[0]
 	quantity=data['form']['quantity']