diff --git a/OpenAPI/TS28104_MdaNrm.yaml b/OpenAPI/TS28104_MdaNrm.yaml
index 384d36a9af75e5aca62551de30cd14443043e180..2405f576f7c43ba13dd93224ce810041e239ff79 100644
--- a/OpenAPI/TS28104_MdaNrm.yaml
+++ b/OpenAPI/TS28104_MdaNrm.yaml
@@ -56,6 +56,7 @@ components:
           properties:
             areaScope:
               type: array
+              uniqueItems: true
               items:
                 $ref: 'TS28623_ComDefs.yaml#/components/schemas/GeoArea'
  
@@ -80,6 +81,7 @@ components:
           type: string
         threshold:
           type: array
+          uniqueItems: true
           items:
             $ref: '#/components/schemas/ThresholdInfo'
         analyticsPeriod:
diff --git a/OpenAPI/TS28104_MdaReport.yaml b/OpenAPI/TS28104_MdaReport.yaml
index dae638adfbf48990881b7673d01b8cde3c4455ad..1ac30cb8169f82d05edda71add0057b88a54a855 100644
--- a/OpenAPI/TS28104_MdaReport.yaml
+++ b/OpenAPI/TS28104_MdaReport.yaml
@@ -56,6 +56,7 @@ components:
                       type: string
                     mDAOutputs:
                       type: array
+                      uniqueItems: true
                       items:
                         $ref: '#/components/schemas/MDAOutputs'
                     mDARequestRef: