diff --git a/SAS/TMSS/backend/src/tmss/tmssapp/schemas/common_schema_template-stations-1.json b/SAS/TMSS/backend/src/tmss/tmssapp/schemas/common_schema_template-stations-1.json
index e3afa001749c54992e3de0cc6938a24ac4ed2867..3aebe9a8389fd54f4b737be5830aecfb1895e62d 100644
--- a/SAS/TMSS/backend/src/tmss/tmssapp/schemas/common_schema_template-stations-1.json
+++ b/SAS/TMSS/backend/src/tmss/tmssapp/schemas/common_schema_template-stations-1.json
@@ -73,7 +73,7 @@
       "items":{
         "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/station"
       },
-      "minItems": 0,
+      "minItems": 1,
       "uniqueItems":true
     },
     "max_number_of_missing_stations": {
@@ -86,7 +86,10 @@
       "type":"object",
       "title": "Station group",
       "description": "A set of predefined list of stations, and a constraint on how many stations are allowed to be missing (due to maintenance for example)",
-      "default":{},
+      "default":{
+        "stations": ["CS002", "CS003", "CS004", "CS005", "CS006", "CS007"],
+        "max_nr_missing": 1
+      },
       "anyOf": [
         {
           "title":"Superterp",
@@ -95,17 +98,18 @@
           "properties":{
             "stations":{
               "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/station_list",
-              "enum": [["CS002", "CS003", "CS004", "CS005", "CS006", "CS007"]],
-              "default": ["CS002", "CS003", "CS004", "CS005", "CS006", "CS007"],
-              "uniqueItems": false
+              "enum": [["CS002", "CS003", "CS004", "CS005", "CS006", "CS007"]]
             },
             "max_nr_missing":{
-              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations",
-              "default": 0
+              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations"
             }
           },
           "required": ["stations", "max_nr_missing"],
-          "additionalProperties": false
+          "additionalProperties": false,
+          "default":{
+            "stations": ["CS002", "CS003", "CS004", "CS005", "CS006", "CS007"],
+            "max_nr_missing": 0
+          }
         },
         {
           "title":"Core",
@@ -114,17 +118,18 @@
           "properties":{
             "stations":{
               "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/station_list",
-              "enum": [["CS001", "CS002", "CS003", "CS004", "CS005", "CS006", "CS007", "CS011", "CS013", "CS017", "CS021", "CS024", "CS026", "CS028", "CS030", "CS031", "CS032", "CS103", "CS201", "CS301", "CS302", "CS401", "CS501"]],
-              "default": ["CS001", "CS002", "CS003", "CS004", "CS005", "CS006", "CS007", "CS011", "CS013", "CS017", "CS021", "CS024", "CS026", "CS028", "CS030", "CS031", "CS032", "CS103", "CS201", "CS301", "CS302", "CS401", "CS501"],
-              "uniqueItems": false
+              "enum": [["CS001", "CS002", "CS003", "CS004", "CS005", "CS006", "CS007", "CS011", "CS013", "CS017", "CS021", "CS024", "CS026", "CS028", "CS030", "CS031", "CS032", "CS103", "CS201", "CS301", "CS302", "CS401", "CS501"]]
             },
             "max_nr_missing":{
-              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations",
-              "default": 4
+              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations"
             }
           },
           "required": ["stations", "max_nr_missing"],
-          "additionalProperties": false
+          "additionalProperties": false,
+          "default":{
+            "stations": ["CS001", "CS002", "CS003", "CS004", "CS005", "CS006", "CS007", "CS011", "CS013", "CS017", "CS021", "CS024", "CS026", "CS028", "CS030", "CS031", "CS032", "CS103", "CS201", "CS301", "CS302", "CS401", "CS501"],
+            "max_nr_missing": 4
+          }
         },
         {
           "title":"Remote",
@@ -133,17 +138,18 @@
           "properties":{
             "stations":{
               "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/station_list",
-              "enum": [["RS106", "RS205", "RS208", "RS210", "RS305", "RS306", "RS307", "RS310", "RS406", "RS407", "RS409", "RS503", "RS508", "RS509"]],
-              "default": ["RS106", "RS205", "RS208", "RS210", "RS305", "RS306", "RS307", "RS310", "RS406", "RS407", "RS409", "RS503", "RS508", "RS509"],
-              "uniqueItems": false
+              "enum": [["RS106", "RS205", "RS208", "RS210", "RS305", "RS306", "RS307", "RS310", "RS406", "RS407", "RS409", "RS503", "RS508", "RS509"]]
             },
             "max_nr_missing":{
-              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations",
-              "default": 4
+              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations"
             }
           },
           "required": ["stations", "max_nr_missing"],
-          "additionalProperties": false
+          "additionalProperties": false,
+          "default": {
+              "stations": ["RS106", "RS205", "RS208", "RS210", "RS305", "RS306", "RS307", "RS310", "RS406", "RS407", "RS409", "RS503", "RS508", "RS509"],
+              "max_nr_missing": 4
+          }
         },
         {
           "title":"Dutch",
@@ -152,17 +158,18 @@
           "properties":{
             "stations":{
               "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/station_list",
-              "enum": [["CS001", "CS002", "CS003", "CS004", "CS005", "CS006", "CS007", "CS011", "CS013", "CS017", "CS021", "CS024", "CS026", "CS028", "CS030", "CS031", "CS032", "CS103", "CS201", "CS301", "CS302", "CS401", "CS501", "RS106", "RS205", "RS208", "RS210", "RS305", "RS306", "RS307", "RS310", "RS406", "RS407", "RS409", "RS503", "RS508", "RS509"]],
-              "default": ["CS001", "CS002", "CS003", "CS004", "CS005", "CS006", "CS007", "CS011", "CS013", "CS017", "CS021", "CS024", "CS026", "CS028", "CS030", "CS031", "CS032", "CS103", "CS201", "CS301", "CS302", "CS401", "CS501", "RS106", "RS205", "RS208", "RS210", "RS305", "RS306", "RS307", "RS310", "RS406", "RS407", "RS409", "RS503", "RS508", "RS509"],
-              "uniqueItems": false
+              "enum": [["CS001", "CS002", "CS003", "CS004", "CS005", "CS006", "CS007", "CS011", "CS013", "CS017", "CS021", "CS024", "CS026", "CS028", "CS030", "CS031", "CS032", "CS103", "CS201", "CS301", "CS302", "CS401", "CS501", "RS106", "RS205", "RS208", "RS210", "RS305", "RS306", "RS307", "RS310", "RS406", "RS407", "RS409", "RS503", "RS508", "RS509"]]
             },
             "max_nr_missing":{
-              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations",
-              "default": 4
+              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations"
             }
           },
           "required": ["stations", "max_nr_missing"],
-          "additionalProperties": false
+          "additionalProperties": false,
+          "default": {
+            "stations": ["CS001", "CS002", "CS003", "CS004", "CS005", "CS006", "CS007", "CS011", "CS013", "CS017", "CS021", "CS024", "CS026", "CS028", "CS030", "CS031", "CS032", "CS103", "CS201", "CS301", "CS302", "CS401", "CS501", "RS106", "RS205", "RS208", "RS210", "RS305", "RS306", "RS307", "RS310", "RS406", "RS407", "RS409", "RS503", "RS508", "RS509"],
+            "max_nr_missing": 4
+          }
         },
         {
           "title":"International",
@@ -171,17 +178,18 @@
           "properties":{
             "stations":{
               "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/station_list",
-              "enum": [["DE601", "DE602", "DE603", "DE604", "DE605", "DE609", "FR606", "SE607", "UK608", "PL610", "PL611", "PL612", "IE613", "LV614"]],
-              "default": ["DE601", "DE602", "DE603", "DE604", "DE605", "DE609", "FR606", "SE607", "UK608", "PL610", "PL611", "PL612", "IE613", "LV614"],
-              "uniqueItems": false
+              "enum": [["DE601", "DE602", "DE603", "DE604", "DE605", "DE609", "FR606", "SE607", "UK608", "PL610", "PL611", "PL612", "IE613", "LV614"]]
             },
             "max_nr_missing":{
-              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations",
-              "default": 2
+              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations"
             }
           },
           "required": ["stations", "max_nr_missing"],
-          "additionalProperties": false
+          "additionalProperties": false,
+          "default": {
+              "stations": ["DE601", "DE602", "DE603", "DE604", "DE605", "DE609", "FR606", "SE607", "UK608", "PL610", "PL611", "PL612", "IE613", "LV614"],
+              "max_nr_missing": 2
+          }
         },
         {
           "title":"International required",
@@ -190,17 +198,18 @@
           "properties":{
             "stations":{
               "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/station_list",
-              "enum": [["DE601", "DE605"]],
-              "default": ["DE601", "DE605"],
-              "uniqueItems": false
+              "enum": [["DE601", "DE605"]]
             },
             "max_nr_missing":{
-              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations",
-              "default": 1
+              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations"
             }
           },
           "required": ["stations", "max_nr_missing"],
-          "additionalProperties": false
+          "additionalProperties": false,
+          "default": {
+              "stations": ["DE601", "DE605"],
+              "max_nr_missing": 1
+          }
         },
         {
           "title":"All",
@@ -209,17 +218,18 @@
           "properties":{
             "stations":{
               "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/station_list",
-              "enum": [["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"]],
-              "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"],
-              "uniqueItems": false
+              "enum": [["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"]]
             },
             "max_nr_missing":{
-              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations",
-              "default": 6
+              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations"
             }
           },
           "required": ["stations", "max_nr_missing"],
-          "additionalProperties": false
+          "additionalProperties": false,
+          "default": {
+            "stations": ["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"],
+            "max_nr_missing": 6
+          }
         },
         {
           "title":"Custom",
@@ -227,20 +237,18 @@
           "type": "object",
           "properties":{
             "stations":{
-              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/station_list",
-              "default": ["CS001"],
-              "minItems": 1,
-              "additionalItems": false,
-              "additionalProperties": false,
-              "uniqueItems": true
+              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/station_list"
             },
             "max_nr_missing":{
-              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations",
-              "default": 0
+              "$ref": "http://tmss.lofar.org/api/schemas/commonschematemplate/stations/1#/definitions/max_number_of_missing_stations"
             }
           },
           "required": ["stations", "max_nr_missing"],
-          "additionalProperties": false
+          "additionalProperties": false,
+          "default": {
+            "stations": ["CS001"],
+            "max_nr_missing": 0
+          }
         }
         ]
     },
diff --git a/SAS/TMSS/backend/src/tmss/tmssapp/schemas/short-observation-pipeline-ingest-scheduling-unit-observation-strategy.json b/SAS/TMSS/backend/src/tmss/tmssapp/schemas/short-observation-pipeline-ingest-scheduling-unit-observation-strategy.json
index a6ef421b0a52437ff6561e2b2ccb795d3d4f0c62..768804b59e502d0d94257c219b212e232cb7e6b4 100644
--- a/SAS/TMSS/backend/src/tmss/tmssapp/schemas/short-observation-pipeline-ingest-scheduling-unit-observation-strategy.json
+++ b/SAS/TMSS/backend/src/tmss/tmssapp/schemas/short-observation-pipeline-ingest-scheduling-unit-observation-strategy.json
@@ -25,7 +25,8 @@
         "antenna_set": "HBA_DUAL_INNER",
         "filter": "HBA_110_190",
         "station_groups": [ {
-            "stations": ["CS002", "CS003", "CS004", "CS005", "CS006", "CS007"]
+            "stations": ["CS002", "CS003", "CS004", "CS005", "CS006", "CS007"],
+            "max_nr_missing": 1
         }],
         "tile_beam": {
           "direction_type": "J2000",