diff --git a/account_financial_report_qweb/report/trial_balance.py b/account_financial_report_qweb/report/trial_balance.py
index f76288d1..369316b1 100644
--- a/account_financial_report_qweb/report/trial_balance.py
+++ b/account_financial_report_qweb/report/trial_balance.py
@@ -75,7 +75,7 @@ class TrialBalanceReportAccount(models.TransientModel):
     )
     hide_line = fields.Boolean(compute='_compute_hide_line')
     # Data fields, used to keep link with real object
-    sequence = fields.Integer(index=True, default=1)
+    sequence = fields.Char(index=True)
     level = fields.Integer(index=True, default=1)
 
     # Data fields, used to keep link with real object
@@ -399,7 +399,7 @@ SELECT
     accgroup.parent_id,
     coalesce(accgroup.code_prefix, accgroup.name),
     accgroup.name,
-    accgroup.parent_left * 100000,
+    accgroup.code_prefix,
     accgroup.level
 FROM
     account_group accgroup"""
@@ -551,7 +551,7 @@ WHERE report_trial_balance_qweb_account.account_group_id = accgroup.id
         account account."""
         query_update_account_group = """
 UPDATE report_trial_balance_qweb_account
-SET sequence = newline.sequence + 1,
+SET sequence = CONCAT(newline.sequence, newline.code),
     level = newline.level + 1
 FROM report_trial_balance_qweb_account as newline
 WHERE newline.account_group_id = report_trial_balance_qweb_account.parent_id