FIX #5748 Bug: Error updating to 4.0.1 with Postgresql. Field must be

varchar.

htdocs/install/mysql/migration/3.9.0-4.0.0.sql

@@ -396,8 +396,8 @@ INSERT INTO llx_c_accounting_category (rowid, code, label, range_account, sens,
 INSERT INTO llx_c_accounting_category (rowid, code, label, range_account, sens, category_type, formula, position, fk_country, active) VALUES (  3,'MARGE',"Marge commerciale", '', 0, 1, '1 + 2', '30', 1, 1);
 
 UPDATE llx_accounting_account SET account_parent = '0' WHERE account_parent = '';
--- VMYSQL4.1 ALTER TABLE llx_accounting_account MODIFY COLUMN account_parent integer DEFAULT 0;
--- VPGSQL8.2 ALTER TABLE llx_accounting_account ALTER COLUMN account_parent TYPE integer USING account_parent::integer;
+-- VMYSQL4.1 ALTER TABLE llx_accounting_account MODIFY COLUMN account_parent varchar(32) DEFAULT '0';
+-- VPGSQL8.2 ALTER TABLE llx_accounting_account ALTER COLUMN account_parent SET DEFAULT '0';
 
 CREATE TABLE llx_accounting_journal
 (

htdocs/install/mysql/tables/llx_accounting_account.sql

@@ -29,7 +29,7 @@ create table llx_accounting_account
   pcg_type        			varchar(20)  NOT NULL,
   pcg_subtype     			varchar(20)  NOT NULL,
   account_number  			varchar(32)  NOT NULL,
-  account_parent  			varchar(32)  DEFAULT '',							-- Hierarchic parent
+  account_parent  			varchar(32)  DEFAULT '0',							-- Hierarchic parent
   label           			varchar(255) NOT NULL,
   fk_accounting_category 	integer DEFAULT 0,
   fk_user_author  			integer DEFAULT NULL,