fix : receipt specimen was not displayed

htdocs/livraison/class/livraison.class.php

@@ -3,6 +3,7 @@
  * Copyright (C) 2005-2010 Regis Houssin         <regis@dolibarr.fr>
  * Copyright (C) 2006-2007 Laurent Destailleur   <eldy@users.sourceforge.net>
  * Copyright (C) 2007      Franky Van Liedekerke <franky.van.liedekerke@telenet.be>
+ * Copyright (C) 2011-2012 Philippe Grand	     <philippe.grand@atoo-net.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -773,7 +774,7 @@ class Livraison extends CommonObject
 
 		// Initialise parametres
 		$this->id=0;
-		$this->ref = 'SPECIMEN_RECEIPT';
+		$this->ref = 'SPECIMEN';
 		$this->specimen=1;
 		$this->socid = 1;
 		$this->date_delivery = $now;