diff --git a/htdocs/install/mysql/migration/8.0.0-9.0.0.sql b/htdocs/install/mysql/migration/8.0.0-9.0.0.sql
index 56f98d28449..443540ac857 100644
--- a/htdocs/install/mysql/migration/8.0.0-9.0.0.sql
+++ b/htdocs/install/mysql/migration/8.0.0-9.0.0.sql
@@ -28,14 +28,12 @@
 -- Note: fields with type BLOB/TEXT can't have default value.
 
 
--- Missing in 8.0 ?
+-- Missing in 8.0
 ALTER TABLE llx_accounting_account DROP FOREIGN KEY fk_accounting_account_fk_pcg_version;
 ALTER TABLE llx_accounting_account MODIFY COLUMN fk_pcg_version varchar(32) NOT NULL;
 ALTER TABLE llx_accounting_system MODIFY COLUMN pcg_version varchar(32) NOT NULL;
 ALTER TABLE llx_accounting_account ADD CONSTRAINT fk_accounting_account_fk_pcg_version    FOREIGN KEY (fk_pcg_version)    REFERENCES llx_accounting_system (pcg_version);
 
-ALTER TABLE llx_accounting_account MODIFY COLUMN account_number varchar(32) NOT NULL;
-
 create table llx_facture_rec_extrafields
 (
   rowid                     integer AUTO_INCREMENT PRIMARY KEY,
@@ -46,7 +44,6 @@ create table llx_facture_rec_extrafields
 
 
 -- For 9.0
-
 ALTER TABLE llx_accounting_account MODIFY COLUMN account_parent varchar(32) DEFAULT NULL;
 
 ALTER TABLE llx_extrafields ADD COLUMN help text NULL;
diff --git a/htdocs/install/mysql/tables/llx_accounting_account.sql b/htdocs/install/mysql/tables/llx_accounting_account.sql
index 024c6ed53bf..79215115cfb 100644
--- a/htdocs/install/mysql/tables/llx_accounting_account.sql
+++ b/htdocs/install/mysql/tables/llx_accounting_account.sql
@@ -29,7 +29,7 @@ create table llx_accounting_account
   pcg_type                  varchar(20)  NOT NULL,			  -- First part of Key for predefined groups
   pcg_subtype               varchar(20)  NOT NULL,            -- Second part of Key for predefined groups 
   account_number            varchar(32)  NOT NULL,
-  account_parent            varchar(32)  DEFAULT NULL,        -- Hierarchic parent.
+  account_parent            integer DEFAULT 0,                -- Hierarchic parent.
   label                     varchar(255) NOT NULL,
   fk_accounting_category    integer      DEFAULT 0,			  -- ID of personalized group for report
   fk_user_author            integer      DEFAULT NULL,