diff --git a/models/pos_kds_report.py b/models/pos_kds_report.py
index 07a7f21..ef08e47 100644
--- a/models/pos_kds_report.py
+++ b/models/pos_kds_report.py
@@ -20,12 +20,12 @@ class PosKdsReportLine(models.Model):
         ('cancelled', 'Cancelled')
     ], string='Status', default='done', index=True)
     
-    preparation_time = fields.Integer('Preparation Time (s)', group_operator='sum', help="Seconds taken to prepare")
-    preparation_time_avg = fields.Integer('Average Preparation Time (s)', group_operator='avg', help="Average seconds taken to prepare")
-    service_time = fields.Integer('Service Time (s)', group_operator='sum', help="Seconds taken to serve")
-    service_time_avg = fields.Integer('Average Service Time (s)', group_operator='avg', help="Average seconds taken to serve")
-    completion_time = fields.Integer('Completion Time (s)', group_operator='sum', help="Total seconds taken to complete (prep + service)")
-    completion_time_avg = fields.Integer('Average Completion Time (s)', group_operator='avg', help="Average total seconds taken to complete")
+    preparation_time = fields.Integer('Preparation Time (s)', aggregator='sum', help="Seconds taken to prepare")
+    preparation_time_avg = fields.Integer('Average Preparation Time (s)', aggregator='avg', help="Average seconds taken to prepare")
+    service_time = fields.Integer('Service Time (s)', aggregator='sum', help="Seconds taken to serve")
+    service_time_avg = fields.Integer('Average Service Time (s)', aggregator='avg', help="Average seconds taken to serve")
+    completion_time = fields.Integer('Completion Time (s)', aggregator='sum', help="Total seconds taken to complete (prep + service)")
+    completion_time_avg = fields.Integer('Average Completion Time (s)', aggregator='avg', help="Average total seconds taken to complete")
     completion_datetime = fields.Datetime('Completion Date', default=fields.Datetime.now, index=True)
 
     @api.depends('product_id')
@@ -76,12 +76,12 @@ class PosKdsReportOrder(models.Model):
         ('cancelled', 'Cancelled')
     ], string='Status', default='done', index=True)
 
-    preparation_time = fields.Integer('Preparation Time (s)', group_operator='sum', help="Max preparation time across lines")
-    preparation_time_avg = fields.Integer('Average Preparation Time (s)', group_operator='avg', help="Average preparation time across lines")
-    service_time = fields.Integer('Service Time (s)', group_operator='sum', help="Max service time across lines")
-    service_time_avg = fields.Integer('Average Service Time (s)', group_operator='avg', help="Average service time across lines")
-    completion_time = fields.Integer('Completion Time (s)', group_operator='sum', help="Max completion time across all lines of the order on this display")
-    completion_time_avg = fields.Integer('Average Completion Time (s)', group_operator='avg', help="Average completion time across all lines of the order on this display")
+    preparation_time = fields.Integer('Preparation Time (s)', aggregator='sum', help="Max preparation time across lines")
+    preparation_time_avg = fields.Integer('Average Preparation Time (s)', aggregator='avg', help="Average preparation time across lines")
+    service_time = fields.Integer('Service Time (s)', aggregator='sum', help="Max service time across lines")
+    service_time_avg = fields.Integer('Average Service Time (s)', aggregator='avg', help="Average service time across lines")
+    completion_time = fields.Integer('Completion Time (s)', aggregator='sum', help="Max completion time across all lines of the order on this display")
+    completion_time_avg = fields.Integer('Average Completion Time (s)', aggregator='avg', help="Average completion time across all lines of the order on this display")
     completion_datetime = fields.Datetime('Completion Date', default=fields.Datetime.now, index=True)
 
     @api.depends('pos_order_id')