diff --git a/account_invoice_constraint_chronology/tests/test_account_invoice_constraint_chronology.py b/account_invoice_constraint_chronology/tests/test_account_invoice_constraint_chronology.py
index 18a73d52779..99c99a059df 100644
--- a/account_invoice_constraint_chronology/tests/test_account_invoice_constraint_chronology.py
+++ b/account_invoice_constraint_chronology/tests/test_account_invoice_constraint_chronology.py
@@ -2,13 +2,19 @@
 # Copyright 2021 CorporateHub (https://corporatehub.eu)
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
 
-from datetime import timedelta
+from datetime import date, timedelta
+
+from freezegun import freeze_time
 
 from odoo import fields
 from odoo.exceptions import UserError
 from odoo.tests import common
 
 
+# in order to avoid a raise caused by the sequence mixin we must ensure
+# that all dates are in the same year, hence we freeze the date
+# in the middle of the year
+@freeze_time(f"{date.today().year}-07-01")
 class TestAccountInvoiceConstraintChronology(common.TransactionCase):
     @classmethod
     def setUpClass(cls):
@@ -170,6 +176,25 @@ def test_modify_invoice_date_validated_past_invoice(self):
         # it should be able to validate, but if we change the date
         # higher than YYYYYMM15 or lower than YYYYYMM05
         # it should not be able to validate.
+
+        # FIX conflict between 'freeze_time' and account module demo data
+        conflicting_invoices = self.env["account.move"]
+        conflicting_names = [
+            "demo_invoice_1",
+            "demo_invoice_2",
+            "demo_invoice_3",
+            "demo_invoice_followup",
+            "demo_invoice_5",
+        ]
+        for name in conflicting_names:
+            conflicting_invoices += self.env.ref(
+                f"account.{self.env.company.id}_{name}"
+            )
+        conflicting_invoices.button_draft()
+        conflicting_invoices.write(
+            {"name": False, "invoice_date": date.today().replace(day=1)}
+        )
+
         after_5_days = self.today + timedelta(days=5)
         after_10_days = self.today + timedelta(days=10)
         after_15_days = self.today + timedelta(days=15)