diff --git a/htdocs/install/mysql/migration/3.9.0-4.0.0.sql b/htdocs/install/mysql/migration/3.9.0-4.0.0.sql
index cb9d1945ed9..78dfbf95be9 100644
--- a/htdocs/install/mysql/migration/3.9.0-4.0.0.sql
+++ b/htdocs/install/mysql/migration/3.9.0-4.0.0.sql
@@ -21,6 +21,9 @@
 -- -- VPGSQL8.2 DELETE FROM llx_usergroup_user      WHERE fk_user      NOT IN (SELECT rowid from llx_user);
 -- -- VMYSQL4.1 DELETE FROM llx_usergroup_user      WHERE fk_usergroup NOT IN (SELECT rowid from llx_usergroup);
 
+-- Drop old table not used (Informations are already presents in llx_accounting_bookkeeping)
+DROP TABLE llx_accountingtransaction;
+DROP TABLE llx_accountingdebcred;
 
 -- Already into 3.9 but we do it again to be sure
 ALTER TABLE llx_product ADD COLUMN localtax1_type varchar(10)  NOT NULL DEFAULT '0' after localtax1_tx; 
diff --git a/htdocs/install/mysql/tables/llx_accountingdebcred.sql b/htdocs/install/mysql/tables/llx_accountingdebcred.sql
deleted file mode 100644
index f7ea28b127a..00000000000
--- a/htdocs/install/mysql/tables/llx_accountingdebcred.sql
+++ /dev/null
@@ -1,26 +0,0 @@
--- ============================================================================
--- Copyright (C) 2004-2006 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 3 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, see <http://www.gnu.org/licenses/>.
---
--- Table of "records" for accountancy expert module
--- ============================================================================
-
-create table llx_accountingdebcred
-(
-	fk_transaction  integer		NOT NULL,
-	account_number  varchar(32) NOT NULL,
-	amount          real		NOT NULL,
-	direction       varchar(1)	NOT NULL
-)ENGINE=innodb;
diff --git a/htdocs/install/mysql/tables/llx_accountingtransaction.sql b/htdocs/install/mysql/tables/llx_accountingtransaction.sql
deleted file mode 100644
index 2b1e595c175..00000000000
--- a/htdocs/install/mysql/tables/llx_accountingtransaction.sql
+++ /dev/null
@@ -1,30 +0,0 @@
--- ============================================================================
--- Copyright (C) 2004-2006 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 3 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, see <http://www.gnu.org/licenses/>.
---
--- Table of "transactions" for accountancy expert module (1 transaction = 2+ records)
--- ============================================================================
-
-create table llx_accountingtransaction
-(
-	rowid           integer 		AUTO_INCREMENT PRIMARY KEY,
-	label           varchar(128)    NOT NULL,
-	datec           date 			NOT NULL,
-	fk_author       varchar(20)		NOT NULL,
-	tms             timestamp,
-    fk_source       integer NOT NULL,
-    sourcetype      varchar(16) NOT NULL,
-    url             varchar(255)
-)ENGINE=innodb;