diff --git a/addons/l10n_ch/models/account_journal.py b/addons/l10n_ch/models/account_journal.py
index 716823c8621..9076a9f128d 100644
--- a/addons/l10n_ch/models/account_journal.py
+++ b/addons/l10n_ch/models/account_journal.py
@@ -30,7 +30,7 @@ class AccountJournal(models.Model):
 
         # The call to super() creates the related bank_account_id field if necessary
         if 'l10n_ch_postal' in vals:
-            for record in self:
+            for record in self.filtered('bank_account_id'):
                 record.bank_account_id.l10n_ch_postal = vals['l10n_ch_postal']
         return rslt