diff --git a/SAS/TMSS/backend/src/tmss/tmssapp/schemas/scheduling_unit_observing_strategy_template/Responsive_Telescope_HBA_LoTSS-1.json b/SAS/TMSS/backend/src/tmss/tmssapp/schemas/scheduling_unit_observing_strategy_template/Responsive_Telescope_HBA_LoTSS-1.json
index 93b65c1563a3a74996f8c68f90a173fb70c2a35f..a6655e7b53de51fad064a0d46e51f16667d26d38 100644
--- a/SAS/TMSS/backend/src/tmss/tmssapp/schemas/scheduling_unit_observing_strategy_template/Responsive_Telescope_HBA_LoTSS-1.json
+++ b/SAS/TMSS/backend/src/tmss/tmssapp/schemas/scheduling_unit_observing_strategy_template/Responsive_Telescope_HBA_LoTSS-1.json
@@ -185,7 +185,7 @@
           "demix": {
             "frequency_steps": 64,
             "ignore_target": false,
-            "sources": {},
+            "sources": [],
             "time_steps": 10
           },
           "flag": {
@@ -556,7 +556,7 @@
           "demix": {
             "frequency_steps": 64,
             "ignore_target": false,
-            "sources": {},
+            "sources": [],
             "time_steps": 10
           },
           "flag": {