[UPD]Update data get function

models/acc_operation.py

@@ -16,7 +16,7 @@ class AccOperation(models.Model):
     _inherit = "acc.operation"
 
     def prepare_values(self):
-        data_values = {}
+
         date_day_start, date_day_end = self.get_last_day("day")
         last_day = date_day_start.strftime("%d %B %Y")
         date_day_start = date_day_start.strftime("%Y-%m-%d")