diff --git a/SAS/TMSS/backend/src/tmss/tmssapp/schemas/task_template-beamforming_observation-1.json b/SAS/TMSS/backend/src/tmss/tmssapp/schemas/task_template-beamforming_observation-1.json
index ca6183d9b0bc64484007c7372866492e5415f657..3a29adce60f228ebd0b50ad67737762d8de91912 100644
--- a/SAS/TMSS/backend/src/tmss/tmssapp/schemas/task_template-beamforming_observation-1.json
+++ b/SAS/TMSS/backend/src/tmss/tmssapp/schemas/task_template-beamforming_observation-1.json
@@ -237,10 +237,10 @@
               "enabled"]
           },
           "stations": {
-            "description": "Stations to beam form. Empty list = beam form all stations in the observation.",
-            "allOf": [{"$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1/#/definitions/station_list"}],
-            "default": [],
-            "minItems": 0
+            "description": "When observing beamforming is done on the intersection of all stations in this list and the used stations in the observation. So, specifyng all possible stations here means that all observation-stations are used. Specifying a small subset here means that only the observing-stations in this small list are used.",
+            "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1/#/definitions/station_list",
+            "default": ["CS001", "CS002", "CS003", "CS004", "CS005", "CS006", "CS007", "CS011", "CS013", "CS017", "CS021", "CS024", "CS026", "CS028", "CS030", "CS031", "CS032", "CS301", "CS302", "CS401", "CS501", "RS106", "RS205", "RS208", "RS210", "RS305", "RS306", "RS307", "RS310", "RS406", "RS407", "RS409", "RS503", "RS508", "RS509", "DE601", "DE602", "DE603", "DE604", "DE605", "DE609", "FR606", "SE607", "UK608", "PL610", "PL611", "PL612", "IE613", "LV614"],
+            "minItems": 1
           }
         },
         "required": [