diff --git a/stock_optional_valuation/stock.py b/stock_optional_valuation/stock.py
index 5c6ab3230..9173df154 100644
--- a/stock_optional_valuation/stock.py
+++ b/stock_optional_valuation/stock.py
@@ -20,3 +20,24 @@
 
 from openerp.osv import fields, orm
 from openerp.tools.translate import _
+
+class stock_location(orm.Model):
+    _inherit = "stock.location"
+    
+    _columns = {
+        'consider_internal': fields.boolean('Consider internal', help="Consider as internal location for inventory valuation: stock moves from internal to internal will not generate accounting entries"),
+        }
+
+class stock_move(orm.Model):
+    _inherit = "stock.move"
+    
+    def _create_product_valuation_moves(self, cr, uid, move, context=None):
+        if move.location_id.company_id == move.location_dest_id.company_id:
+            if (move.location_id.usage == 'internal' or
+                move.location_id.consider_internal) and (
+                move.location_dest_id.usage == 'internal' or
+                move.location_dest_id.consider_internal):
+                return
+        res=super(stock_move,self)._create_product_valuation_moves(
+            cr, uid, move, context=context)
+        return res