diff --git a/htdocs/install/mysql/migration/3.0.0-3.1.0.sql b/htdocs/install/mysql/migration/3.0.0-3.1.0.sql
index 0e909015a03..d089caed0e4 100755
--- a/htdocs/install/mysql/migration/3.0.0-3.1.0.sql
+++ b/htdocs/install/mysql/migration/3.0.0-3.1.0.sql
@@ -75,9 +75,10 @@ CREATE TABLE llx_c_availability
 	code		varchar(30) NOT NULL,
 	label		varchar(60) NOT NULL,
 	active		tinyint 	DEFAULT 1  NOT NULL
-
 )ENGINE=innodb;
 
+ALTER TABLE llx_c_availability ADD UNIQUE INDEX uk_c_availability(code);
+
 -- Use table name input_reason to match also input_method
 DROP table llx_c_demand_reason;
 CREATE TABLE llx_c_input_reason
@@ -88,6 +89,8 @@ CREATE TABLE llx_c_input_reason
 	active		tinyint 	DEFAULT 1  NOT NULL
 )ENGINE=innodb;
 
+ALTER TABLE llx_c_input_reason ADD UNIQUE INDEX uk_c_input_reason(code);
+
 INSERT INTO llx_c_input_reason (rowid,code,label,active) VALUES (1, 'SRC_INTE',       'Web site', 1);
 INSERT INTO llx_c_input_reason (rowid,code,label,active) VALUES (2, 'SRC_CAMP_MAIL',  'Mailing campaign', 1);
 INSERT INTO llx_c_input_reason (rowid,code,label,active) VALUES (3, 'SRC_CAMP_PHO',   'Phone campaign', 1);
diff --git a/htdocs/install/mysql/tables/llx_c_availability.key.sql b/htdocs/install/mysql/tables/llx_c_availability.key.sql
new file mode 100755
index 00000000000..7b5fa661d7d
--- /dev/null
+++ b/htdocs/install/mysql/tables/llx_c_availability.key.sql
@@ -0,0 +1,22 @@
+-- ========================================================================
+-- Copyright (C) 2004-2005 Rodolphe Quiedeville <rodolphe@quiedeville.org>
+-- Copyright (C) 2005-2009 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
+-- 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.
+--
+-- $Id$
+-- ========================================================================
+
+ALTER TABLE llx_c_availability ADD UNIQUE INDEX uk_c_availability(code);
diff --git a/htdocs/install/mysql/tables/llx_c_input_reason.key.sql b/htdocs/install/mysql/tables/llx_c_input_reason.key.sql
new file mode 100755
index 00000000000..e1cab3b3368
--- /dev/null
+++ b/htdocs/install/mysql/tables/llx_c_input_reason.key.sql
@@ -0,0 +1,22 @@
+-- ========================================================================
+-- Copyright (C) 2004-2005 Rodolphe Quiedeville <rodolphe@quiedeville.org>
+-- Copyright (C) 2005-2009 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
+-- 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.
+--
+-- $Id$
+-- ========================================================================
+
+ALTER TABLE llx_c_input_reason ADD UNIQUE INDEX uk_c_input_reason(code);
diff --git a/htdocs/install/mysql/tables/llx_c_input_reason.sql b/htdocs/install/mysql/tables/llx_c_input_reason.sql
new file mode 100755
index 00000000000..88327949106
--- /dev/null
+++ b/htdocs/install/mysql/tables/llx_c_input_reason.sql
@@ -0,0 +1,30 @@
+-- ========================================================================
+-- Copyright (C) 2004-2005 Rodolphe Quiedeville <rodolphe@quiedeville.org>
+-- Copyright (C) 2005-2009 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
+-- 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.
+--
+-- $Id$
+-- ========================================================================
+
+create table llx_c_input_reason
+(
+  rowid		integer AUTO_INCREMENT PRIMARY KEY,
+  code		varchar(30),
+  label		varchar(60),
+  active	tinyint default 1  NOT NULL
+  
+)ENGINE=innodb;
+