diff --git a/SAS/TMSS/src/tmss/tmssapp/schemas/task-observation-with-stations.json b/SAS/TMSS/src/tmss/tmssapp/schemas/task-observation-with-stations.json
index 278ccb2a816bc645290dcafbddcf5d9d83eece79..9249751e45316a485a76766a8e4835b2e4110f92 100644
--- a/SAS/TMSS/src/tmss/tmssapp/schemas/task-observation-with-stations.json
+++ b/SAS/TMSS/src/tmss/tmssapp/schemas/task-observation-with-stations.json
@@ -236,7 +236,8 @@
             "type": "array",
             "title": "Subband list",
             "additionalItems": false,
-            "default": [],
+            "minItems": 1,
+            "default": [0],
             "items": {
               "type": "integer",
               "title": "Subband",
diff --git a/SAS/TMSS/src/tmss/tmssapp/schemas/task-stations.json b/SAS/TMSS/src/tmss/tmssapp/schemas/task-stations.json
index 3e7fc9dbf0d90999a5260fe850c0a672813178bf..26f6690bcfe44c0d03f415ef2dcf8900e9be5c02 100644
--- a/SAS/TMSS/src/tmss/tmssapp/schemas/task-stations.json
+++ b/SAS/TMSS/src/tmss/tmssapp/schemas/task-stations.json
@@ -122,6 +122,8 @@
                     "type": "array",
                     "additionalItems": false,
                     "default": [{}],
+                    "minItems": 1,
+                    "uniqueItems": true,
                     "items": {
                         "type": "object",
                         "title": "Station set",