diff --git a/odoo/addons/base/i18n/base.pot b/odoo/addons/base/i18n/base.pot
index 46655c821e6..c3819e0cb5a 100644
--- a/odoo/addons/base/i18n/base.pot
+++ b/odoo/addons/base/i18n/base.pot
@@ -23895,14 +23895,6 @@ msgid ""
 "%s"
 msgstr ""
 
-#. module: base
-#: code:addons/base/models/ir_sequence.py:0
-#, python-format
-msgid ""
-"This transaction wasn't executed because another transaction is already "
-"using the same no-gap sequence. Please try again later."
-msgstr ""
-
 #. module: base
 #: model:ir.model.fields,field_description:base.field_res_lang__thousands_sep
 msgid "Thousands Separator"
diff --git a/odoo/addons/base/models/ir_sequence.py b/odoo/addons/base/models/ir_sequence.py
index 3e13dccdade..1982248b8fb 100644
--- a/odoo/addons/base/models/ir_sequence.py
+++ b/odoo/addons/base/models/ir_sequence.py
@@ -53,14 +53,8 @@ def _select_nextval(cr, seq_name):
 
 def _update_nogap(self, number_increment):
     number_next = self.number_next
-    try:
-        self._cr.execute("SELECT number_next FROM %s WHERE id=%%s FOR UPDATE NOWAIT" % self._table, [self.id])
-        self._cr.execute("UPDATE %s SET number_next=number_next+%%s WHERE id=%%s " % self._table, (number_increment, self.id))
-    except OperationalError as e:
-        if e.pgcode == errorcodes.LOCK_NOT_AVAILABLE:
-            raise UserError(_("This transaction wasn't executed because another transaction is already using the same no-gap sequence. Please try again later."))
-        else:
-            raise
+    self._cr.execute("SELECT number_next FROM %s WHERE id=%%s FOR UPDATE NOWAIT" % self._table, [self.id])
+    self._cr.execute("UPDATE %s SET number_next=number_next+%%s WHERE id=%%s " % self._table, (number_increment, self.id))
     self.invalidate_cache(['number_next'], [self.id])
     return number_next
 
diff --git a/odoo/addons/base/tests/test_ir_sequence.py b/odoo/addons/base/tests/test_ir_sequence.py
index 8c27dc18d74..e9a3b97bbf7 100644
--- a/odoo/addons/base/tests/test_ir_sequence.py
+++ b/odoo/addons/base/tests/test_ir_sequence.py
@@ -7,7 +7,6 @@ import psycopg2
 import psycopg2.errorcodes
 
 import odoo
-from odoo.exceptions import UserError
 from odoo.tests import common
 from odoo.tests.common import BaseCase
 
@@ -93,10 +92,13 @@ class TestIrSequenceNoGap(BaseCase):
         with environment() as env0:
             with environment() as env1:
                 env1.cr._default_log_exceptions = False # Prevent logging a traceback
-                with self.assertRaises(UserError) as e:
+                # NOTE: The error has to be an OperationalError
+                # s.t. the automatic request retry (service/model.py) works.
+                with self.assertRaises(psycopg2.OperationalError) as e:
                     n0 = env0['ir.sequence'].next_by_code('test_sequence_type_2')
                     self.assertTrue(n0)
                     n1 = env1['ir.sequence'].next_by_code('test_sequence_type_2')
+                self.assertEqual(e.exception.pgcode, psycopg2.errorcodes.LOCK_NOT_AVAILABLE, msg="postgresql returned an incorrect errcode")
 
     @classmethod
     def tearDownClass(cls):