diff --git a/addons/account/i18n/account.pot b/addons/account/i18n/account.pot
index 872507dc297..75326f9b110 100644
--- a/addons/account/i18n/account.pot
+++ b/addons/account/i18n/account.pot
@@ -8799,6 +8799,13 @@ msgid "You cannot do this modification on a reconciled entry. You can just chang
 "%s."
 msgstr ""
 
+#. module: account
+#: code:addons/account/models/account.py:329
+#, python-format
+msgid "You cannot empty the account number once set.\n"
+"If you would like to delete the account number, you can do it from the Bank Accounts list."
+msgstr ""
+
 #. module: account
 #: code:addons/account/models/account.py:96
 #, python-format
diff --git a/addons/account/models/account.py b/addons/account/models/account.py
index 36b0077a701..ef521dc7ea3 100644
--- a/addons/account/models/account.py
+++ b/addons/account/models/account.py
@@ -325,6 +325,8 @@ class AccountJournal(models.Model):
                     self.default_debit_account_id.currency_id = vals['currency_id']
                 if not 'default_credit_account_id' in vals and self.default_credit_account_id:
                     self.default_credit_account_id.currency_id = vals['currency_id']
+            if 'bank_acc_number' in vals and not vals.get('bank_acc_number') and journal.bank_account_id:
+                raise UserError(_('You cannot empty the account number once set.\nIf you would like to delete the account number, you can do it from the Bank Accounts list.'))
         result = super(AccountJournal, self).write(vals)
 
         # Create the bank_account_id if necessary