diff --git a/htdocs/telephonie/sql/llx_telephonie_tarif_montant.key.sql b/htdocs/telephonie/sql/llx_telephonie_tarif_montant.key.sql
new file mode 100644
index 00000000000..1422701f224
--- /dev/null
+++ b/htdocs/telephonie/sql/llx_telephonie_tarif_montant.key.sql
@@ -0,0 +1,28 @@
+-- ========================================================================
+-- Copyright (C) 2004 Rodolphe Quiedeville <rodolphe@quiedeville.org>
+--
+-- 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
+-- the Free Software Foundation; either version 2 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program; if not, write to the Free Software
+-- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+--
+-- $Id$
+-- $Source$
+--
+-- ========================================================================
+--
+--
+
+ALTER TABLE llx_telephonie_tarif_montant ADD INDEX (fk_tarif);
+
+ALTER TABLE llx_telephonie_tarif_montant ADD FOREIGN KEY (fk_tarif) REFERENCES llx_telephonie_tarif (rowid);
+