diff --git a/SAS/TMSS/backend/src/tmss/tmssapp/viewsets/scheduling.py b/SAS/TMSS/backend/src/tmss/tmssapp/viewsets/scheduling.py
index 55651cf119fd0d25f5f2dc3010c085cd822dda6a..a6a09de435f706ff74c41a8821ba0125e7769760 100644
--- a/SAS/TMSS/backend/src/tmss/tmssapp/viewsets/scheduling.py
+++ b/SAS/TMSS/backend/src/tmss/tmssapp/viewsets/scheduling.py
@@ -140,6 +140,10 @@ class SubTaskFilter(property_filters.PropertyFilterSet):
             'scheduled_on_sky_stop_time': ['lt', 'gt'],
             'actual_on_sky_start_time': ['lt', 'gt'],
             'actual_on_sky_stop_time': ['lt', 'gt'],
+            'scheduled_process_start_time': ['lt', 'gt'],
+            'scheduled_process_stop_time': ['lt', 'gt'],
+            'actual_process_start_time': ['lt', 'gt'],
+            'actual_process_stop_time': ['lt', 'gt'],
             'cluster__name': ['exact', 'icontains'],
         }
         filter_overrides = FILTER_OVERRIDES