diff --git a/addons/mrp/procurement.py b/addons/mrp/procurement.py
index 0fab30a0b41..f1c5b66d7d9 100644
--- a/addons/mrp/procurement.py
+++ b/addons/mrp/procurement.py
@@ -123,12 +123,3 @@ class procurement_order(osv.osv):
         for procurement in self.browse(cr, uid, ids, context=context):
             body = _("Manufacturing Order <em>%s</em> created.") % ( procurement.production_id.name,)
             self.message_post(cr, uid, [procurement.id], body=body, context=context)
-    
-
-class sale_order(osv.Model):
-    _inherit ='sale.order'
-
-    def _prepare_order_line_procurement(self, cr, uid, order, line, move_id, date_planned, context=None):
-        result = super(sale_order, self)._prepare_order_line_procurement(cr, uid, order, line, move_id, date_planned, context)
-        result['property_ids'] = [(6, 0, [x.id for x in line.property_ids])]
-        return result
diff --git a/addons/sale_mrp/sale_mrp.py b/addons/sale_mrp/sale_mrp.py
index 63c741af61e..ffdf0384913 100644
--- a/addons/sale_mrp/sale_mrp.py
+++ b/addons/sale_mrp/sale_mrp.py
@@ -87,6 +87,11 @@ class mrp_production(osv.osv):
         'sale_ref': fields.function(_ref_calc, multi='sale_name', type='char', string='Sale Reference', help='Indicate the Customer Reference from sales order.'),
     }
 
-mrp_production()
 
-# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
+class sale_order(osv.Model):
+    _inherit ='sale.order'
+
+    def _prepare_order_line_procurement(self, cr, uid, order, line, move_id, date_planned, context=None):
+        result = super(sale_order, self)._prepare_order_line_procurement(cr, uid, order, line, move_id, date_planned, context)
+        result['property_ids'] = [(6, 0, [x.id for x in line.property_ids])]
+        return result