diff --git a/odex25_hr/exp_official_mission/models/hr_official_mission.py b/odex25_hr/exp_official_mission/models/hr_official_mission.py
index 769e908b8..f234ec0cf 100644
--- a/odex25_hr/exp_official_mission/models/hr_official_mission.py
+++ b/odex25_hr/exp_official_mission/models/hr_official_mission.py
@@ -367,7 +367,7 @@ class HrOfficialMission(models.Model):
                                     line.days = len(date_range)
                                 else:
                                     unique_dates = set(item.table_ids.mapped('date'))
-                                    item.days = len(unique_dates)
+                                    line.days = len(unique_dates)
                                 if item.mission_type.related_with_financial is True:
                                     if item.mission_type.type_of_payment == 'fixed':
                                         if item.mission_type.day_price: