diff --git a/htdocs/install/mysql/migration/2.6.0-2.7.0.sql b/htdocs/install/mysql/migration/2.6.0-2.7.0.sql
index 00df2853388..ea4474e5dc2 100644
--- a/htdocs/install/mysql/migration/2.6.0-2.7.0.sql
+++ b/htdocs/install/mysql/migration/2.6.0-2.7.0.sql
@@ -499,3 +499,7 @@ ALTER TABLE llx_adherent DROP INDEX idx_adherent_fk_soc;
 ALTER TABLE llx_propaldet ADD INDEX idx_propaldet_fk_propal (fk_propal);
 -- V4.1 delete from llx_propaldet where fk_propal not in (select rowid from llx_propal);
 ALTER TABLE llx_propaldet ADD CONSTRAINT fk_propaldet_fk_propal FOREIGN KEY (fk_propal) REFERENCES llx_propal (rowid);
+
+ALTER TABLE llx_bank_class DROP INDEX idx_bank_class_lineid;
+ALTER TABLE llx_bank_class DROP INDEX uk_bank_class_lineid;
+ALTER TABLE llx_bank_class ADD UNIQUE INDEX uk_bank_class_lineid (lineid, fk_categ);
diff --git a/htdocs/install/mysql/migration/2.7.0-2.8.0.sql b/htdocs/install/mysql/migration/2.7.0-2.8.0.sql
index dc7465061ff..ffc3d9e97b0 100755
--- a/htdocs/install/mysql/migration/2.7.0-2.8.0.sql
+++ b/htdocs/install/mysql/migration/2.7.0-2.8.0.sql
@@ -99,3 +99,8 @@ create table llx_extra_fields_values
 
 ALTER TABLE llx_extra_fields_values ADD INDEX idx_extra_fields_values_fk_extra_fields (fk_extra_fields, entity);
 ALTER TABLE llx_extra_fields_values ADD CONSTRAINT fk_extra_fields_values_fk_extra_fields FOREIGN KEY (fk_extra_fields) REFERENCES llx_extra_fields (rowid);
+
+ALTER TABLE llx_bank_class DROP INDEX idx_bank_class_lineid;
+ALTER TABLE llx_bank_class DROP INDEX uk_bank_class_lineid;
+ALTER TABLE llx_bank_class ADD UNIQUE INDEX uk_bank_class_lineid (lineid, fk_categ);
+
diff --git a/htdocs/install/mysql/tables/llx_bank_class.key.sql b/htdocs/install/mysql/tables/llx_bank_class.key.sql
index 8d812509b93..f6301a24919 100644
--- a/htdocs/install/mysql/tables/llx_bank_class.key.sql
+++ b/htdocs/install/mysql/tables/llx_bank_class.key.sql
@@ -1,5 +1,5 @@
 -- ===================================================================
--- Copyright (C) 2004-2007 Laurent Destailleur  <eldy@users.sourceforge.net>
+-- Copyright (C) 2004-2010 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
@@ -18,4 +18,4 @@
 -- $Id$
 -- ===================================================================
 
-ALTER TABLE llx_bank_class ADD UNIQUE INDEX idx_bank_class_lineid (lineid);
+ALTER TABLE llx_bank_class ADD UNIQUE INDEX uk_bank_class_lineid (lineid, fk_categ);