diff --git a/htdocs/commande/class/commande.class.php b/htdocs/commande/class/commande.class.php
index 567c3f1a702..fff3f64de8d 100644
--- a/htdocs/commande/class/commande.class.php
+++ b/htdocs/commande/class/commande.class.php
@@ -978,6 +978,7 @@ class Commande extends CommonOrder
         }
 
         $this->id=0;
+		$this->ref = '';
         $this->statut=self::STATUS_DRAFT;
 
         // Clear fields
@@ -986,18 +987,9 @@ class Commande extends CommonOrder
         $this->date_creation      = '';
         $this->date_validation    = '';
         $this->ref_client         = '';
-
-        // Set ref
-		$this->ref = '(PROV)';
-
+		
         // Create clone
         $result=$this->create($user);
-        if ($result < 0) $error++;
-
-		// Set new ref
-		$newref='(PROV'.$this->id.')';
-        $sql = 'UPDATE '.MAIN_DB_PREFIX."commande SET ref='".$this->db->escape($newref)."' WHERE rowid=".$this->id;
-        $result=$this->db->query($sql);
         if ($result < 0) $error++;
 
         if (! $error)