diff --git a/account_financial_report/__manifest__.py b/account_financial_report/__manifest__.py
index c2125b1b..2a8c29d3 100644
--- a/account_financial_report/__manifest__.py
+++ b/account_financial_report/__manifest__.py
@@ -5,7 +5,7 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 {
     "name": "Account Financial Reports",
-    "version": "13.0.1.1.0",
+    "version": "13.0.1.1.1",
     "category": "Reporting",
     "summary": "OCA Financial Reports",
     "author": "Camptocamp SA,"
diff --git a/account_financial_report/report/open_items.py b/account_financial_report/report/open_items.py
index f9f5143f..be0c21f9 100644
--- a/account_financial_report/report/open_items.py
+++ b/account_financial_report/report/open_items.py
@@ -2,6 +2,7 @@
 # Copyright 2020 ForgeFlow S.L. (https://www.forgeflow.com)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
+import operator
 from datetime import date, datetime
 
 from odoo import api, models