diff --git a/htdocs/install/mysql/migration/18.0.0-19.0.0.sql b/htdocs/install/mysql/migration/18.0.0-19.0.0.sql
index a48cd480ef2..447fc69a05d 100644
--- a/htdocs/install/mysql/migration/18.0.0-19.0.0.sql
+++ b/htdocs/install/mysql/migration/18.0.0-19.0.0.sql
@@ -86,3 +86,5 @@ ALTER TABLE llx_adherent DROP COLUMN whatsapp;
 
 ALTER TABLE llx_societe DROP COLUMN skype;
 
+ALTER TABLE llx_prelevement_demande ADD INDEX idx_prelevement_demande_ext_payment_id (ext_payment_id);
+
diff --git a/htdocs/install/mysql/tables/llx_prelevement_demande.key.sql b/htdocs/install/mysql/tables/llx_prelevement_demande.key.sql
index 5e047323189..9694af1e7a5 100644
--- a/htdocs/install/mysql/tables/llx_prelevement_demande.key.sql
+++ b/htdocs/install/mysql/tables/llx_prelevement_demande.key.sql
@@ -1,5 +1,6 @@
 -- ===================================================================
 -- Copyright (C) 2005 Rodolphe Quiedeville <rodolphe@quiedeville.org>
+-- Copyright (C) 2023 Laurent Destailleur  <eldy@users.sourceforge.net>
 --
 -- 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
@@ -19,4 +20,4 @@
 
 ALTER TABLE llx_prelevement_demande ADD INDEX idx_prelevement_demande_fk_facture (fk_facture);
 ALTER TABLE llx_prelevement_demande ADD INDEX idx_prelevement_demande_fk_facture_fourn (fk_facture_fourn);
-
+ALTER TABLE llx_prelevement_demande ADD INDEX idx_prelevement_demande_ext_payment_id (ext_payment_id);