diff --git a/SAS/TMSS/src/tmss/tmssapp/schemas/simple-observation-scheduling-unit-observation-strategy.json b/SAS/TMSS/src/tmss/tmssapp/schemas/simple-observation-scheduling-unit-observation-strategy.json
index f7071de3042b31e0fb07f9c1ebfbed4efd07a827..cfa908a68e642538b03c398a65e6d752f2e81db2 100644
--- a/SAS/TMSS/src/tmss/tmssapp/schemas/simple-observation-scheduling-unit-observation-strategy.json
+++ b/SAS/TMSS/src/tmss/tmssapp/schemas/simple-observation-scheduling-unit-observation-strategy.json
@@ -52,6 +52,12 @@
   "task_scheduling_relations": [
   ],
   "parameters": [
+    {
+      "refs": [
+        "#/tasks/Observation/specifications_doc/duration"
+      ],
+      "name": "Duration"
+    },
     {
       "refs": [
         "#/tasks/Observation/specifications_doc/SAPs/0/digital_pointing"