[IMP] Warning tracking field without mail inherit

To use tracking attribute field it's necesary that the model inherithed from mail treath abstract model

pms/models/pms_service.py

@@ -188,7 +188,6 @@ class PmsService(models.Model):
         store=True,
         digits=("Discount"),
         compute="_compute_discount",
-        tracking=True,
     )
 
     # Compute and Search methods