diff --git a/htdocs/install/mysql/data/llx_c_action_trigger.sql b/htdocs/install/mysql/data/llx_c_action_trigger.sql
index 1dde6d5d37cfb611ef00a925573092a064125ee2..408c7a36ff6e28f66379314eee948b77113552a3 100644
--- a/htdocs/install/mysql/data/llx_c_action_trigger.sql
+++ b/htdocs/install/mysql/data/llx_c_action_trigger.sql
@@ -8,6 +8,7 @@
 -- Copyright (C) 2010-2013  Juanjo Menent           <jmenent@2byte.es>
 -- Copyright (C) 2013       Cedric Gross            <c.gross@kreiz-it.fr>
 -- Copyright (C) 2014       Raphaël Doursenaud      <rdoursenaud@gpcsolutions.fr>
+-- Copyright (C) 2015       Bahfir Abbes            <bafbes@gmail.com>
 --
 -- 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
@@ -74,3 +75,4 @@ insert into llx_c_action_trigger (code,label,description,elementtype,rang) value
 insert into llx_c_action_trigger (code,label,description,elementtype,rang) values ('TASK_CREATE','Task created','Executed when a project task is created','project',35);
 insert into llx_c_action_trigger (code,label,description,elementtype,rang) values ('TASK_MODIFY','Task modified','Executed when a project task is modified','project',36);
 insert into llx_c_action_trigger (code,label,description,elementtype,rang) values ('TASK_DELETE','Task deleted','Executed when a project task is deleted','project',37);
+insert into llx_c_action_trigger (code,label,description,elementtype,rang) values ('BILL_SUPPLIER_UNVALIDATE',	'Supplier invoice unvalidated',	'Executed when a supplier invoice status is set back to draft',	'invoice_supplier',15);
diff --git a/htdocs/install/mysql/migration/3.7.0-3.8.0.sql b/htdocs/install/mysql/migration/3.7.0-3.8.0.sql
index aabca14f5a16e77817f896912568a1daca5d12c4..c44fa88c49cf1c1990a983bd5a8a12f1fa5d3ea3 100755
--- a/htdocs/install/mysql/migration/3.7.0-3.8.0.sql
+++ b/htdocs/install/mysql/migration/3.7.0-3.8.0.sql
@@ -644,4 +644,5 @@ ALTER TABLE llx_actioncomm ADD COLUMN recurdateend datetime;
 
 ALTER TABLE llx_stcomm ADD COLUMN picto varchar(128);
 
-
+-- New trigger for Supplier invoice unvalidation
+INSERT INTO llx_c_action_trigger (code, label, description, elementtype, rang) VALUES ('BILL_SUPPLIER_UNVALIDATE','Supplier invoice unvalidated','Executed when a supplier invoice status is set back to draft','invoice_supplier',15);