diff --git a/OpenAPI/TS28623_ComDefs.yaml b/OpenAPI/TS28623_ComDefs.yaml
index 962116a9b0e9a661072f06be9a704b1862d4cfb3..d3fb8663c99cbd71bad9f245e5f27accab4b7a03 100755
--- a/OpenAPI/TS28623_ComDefs.yaml
+++ b/OpenAPI/TS28623_ComDefs.yaml
@@ -69,11 +69,13 @@ components:
     DnList:
       description: This datatype is used for writable attribute    
       type: array
+      uniqueItems: true
       items:
         $ref: '#/components/schemas/Dn'
     DnListRo:
       description: This datatype is used for readOnly attribute    
       type: array
+      uniqueItems: true
       items:
         $ref: '#/components/schemas/DnRo'
 
@@ -170,6 +172,7 @@ components:
           $ref: '#/components/schemas/Float'
     ConvexGeoPolygon:
       type: array
+      uniqueItems: true
       items:
         $ref: '#/components/schemas/GeoCoordinate'
       minItems: 3
diff --git a/OpenAPI/TS28623_GenericNrm.yaml b/OpenAPI/TS28623_GenericNrm.yaml
index 1346cf3a95ebc02a366e20b4cc1583e8d7105be0..ed0dbc2931fd7df6648bd18087df648eb4398a8d 100755
--- a/OpenAPI/TS28623_GenericNrm.yaml
+++ b/OpenAPI/TS28623_GenericNrm.yaml
@@ -59,17 +59,20 @@ components:
       properties:
         performanceMetrics:
           type: array
+          uniqueItems: true
           items:
             type: string
           readOnly: true  
         granularityPeriods:
           type: array
+          uniqueItems: true
           items:
             type: integer
             minimum: 1
           readOnly: true  
         reportingMethods:
           type: array
+          uniqueItems: true
           items:
             type: string
             enum:
@@ -79,6 +82,7 @@ components:
             readOnly: true               
         reportingPeriods:
           type: array
+          uniqueItems: true
           items:
             type: integer
             minimum: 1
@@ -189,16 +193,19 @@ components:
           properties:
             timeIntervals:
               type: array
+              uniqueItems: true
               items:
                 $ref: 'TS28623_ComDefs.yaml#/components/schemas/TimeInterval'
         - type: object
           properties:
             timeIntervals:
               type: array
+              uniqueItems: true
               items:
                 $ref: 'TS28623_ComDefs.yaml#/components/schemas/TimeInterval'
             daysOfWeek:
               type: array
+              uniqueItems: true
               items:
                 type: string
                 enum:
@@ -213,10 +220,12 @@ components:
           properties:
             timeIntervals:
               type: array
+              uniqueItems: true
               items:
                 $ref: 'TS28623_ComDefs.yaml#/components/schemas/TimeInterval'
             daysOfMonth:
               type: array
+              uniqueItems: true
               items:
                 type: integer
                 minimum: 0
@@ -228,12 +237,14 @@ components:
           $ref: 'TS28623_ComDefs.yaml#/components/schemas/PlmnId'
         cAGIdList:
           type: array
+          uniqueItems: true
           items:
             type: string
           minItems: 1
           maxItems: 256  
         nIDList:
           type: array
+          uniqueItems: true
           items:
             $ref: 'TS28623_ComDefs.yaml#/components/schemas/Nid'
           minItems: 1
@@ -288,6 +299,7 @@ components:
           type: string
         setOfMcc:
           type: array
+          uniqueItems: true
           items:
             $ref: 'TS28623_ComDefs.yaml#/components/schemas/Mcc'
           readOnly: true  
@@ -296,10 +308,12 @@ components:
           readOnly: true
         supportedPerfMetricGroups:
           type: array
+          uniqueItems: true
           items:
             $ref: '#/components/schemas/SupportedPerfMetricGroup'
         supportedTraceMetrics:
           type: array
+          uniqueItems: true
           items:
             type: string
     ManagedElement-Attr:
@@ -309,6 +323,7 @@ components:
           type: string
         managedElementTypeList:
           type: array
+          uniqueItems: true
           items:
             type: string
         userLabel:
@@ -329,10 +344,12 @@ components:
           type: integer
         supportedPerfMetricGroups:
           type: array
+          uniqueItems: true
           items:
             $ref: '#/components/schemas/SupportedPerfMetricGroup'
         supportedTraceMetrics:
           type: array
+          uniqueItems: true
           items:
             type: string
           readOnly: true  
@@ -384,20 +401,24 @@ components:
           type: string
         vnfParametersList:
           type: array
+          uniqueItems: true
           items:
             $ref: '#/components/schemas/VnfParameter'
         peeParametersList:
           type: array
+          uniqueItems: true
           items:
             $ref: '#/components/schemas/PeeParameter'
         priorityLabel:
           type: integer
         supportedPerfMetricGroups:
           type: array
+          uniqueItems: true
           items:
             $ref: '#/components/schemas/SupportedPerfMetricGroup'
         supportedTraceMetrics:
           type: array
+          uniqueItems: true
           items:
             type: string
     EP_RP-Attr:
@@ -410,6 +431,7 @@ components:
           readOnly: true
         supportedPerfMetricGroups:
           type: array
+          uniqueItems: true
           items:
             $ref: '#/components/schemas/SupportedPerfMetricGroup'
 
@@ -500,6 +522,7 @@ components:
               properties:
                 schedulingTimes:
                   type: array
+                  uniqueItems: true
                   items:
                     $ref: '#/components/schemas/SchedulingTime'
                   minItems: 1
@@ -530,10 +553,12 @@ components:
               properties:
                 notificationTypes:
                   type: array
+                  uniqueItems: true
                   items:
                     $ref: 'TS28623_ComDefs.yaml#/components/schemas/NotificationType'
                 notificationProtocols:
                   type: array
+                  uniqueItems: true
                   items:
                     type: string
                     enum:
diff --git a/OpenAPI/TS28623_MnSRegistryNrm.yaml b/OpenAPI/TS28623_MnSRegistryNrm.yaml
index 153a45cc9441d0973786250ca48c8672e5817cc8..eddba948c6e790e44d5742e2387bad376f592059 100644
--- a/OpenAPI/TS28623_MnSRegistryNrm.yaml
+++ b/OpenAPI/TS28623_MnSRegistryNrm.yaml
@@ -61,6 +61,7 @@ components:
                  contain the DN of the SubNetwork instead of the DNs of the individual managed 
                  entities within the SubNetwork.
                type: array
+               uniqueItems: true
                items:
                  $ref: 'TS28623_ComDefs.yaml#/components/schemas/DnRo'
 
diff --git a/OpenAPI/TS28623_PmControlNrm.yaml b/OpenAPI/TS28623_PmControlNrm.yaml
index 720842e2d5fdc2a1da51430b9e15cb3ce9e0421b..fd5ea0d2a5b7447f6f1016fa29183c739b7c527a 100644
--- a/OpenAPI/TS28623_PmControlNrm.yaml
+++ b/OpenAPI/TS28623_PmControlNrm.yaml
@@ -47,6 +47,7 @@ components:
                   type: string
                 performanceMetrics:
                   type: array
+                  uniqueItems: true
                   items:
                     type: string
                 granularityPeriod:
diff --git a/OpenAPI/TS28623_QoEMeasurementCollectionNrm.yaml b/OpenAPI/TS28623_QoEMeasurementCollectionNrm.yaml
index c7811203e19e34d545a025e518ac795c0680fcbe..1ee6c7c98ae5be4bca9a61be43df54f451534063 100644
--- a/OpenAPI/TS28623_QoEMeasurementCollectionNrm.yaml
+++ b/OpenAPI/TS28623_QoEMeasurementCollectionNrm.yaml
@@ -45,6 +45,7 @@ components:
                     - VR
                 areaScope:
                   type: array
+                  uniqueItems: true
                   items:
                     $ref: 'TS28623_GenericNrm.yaml#/components/schemas/AreaScope'
                 qoECollectionEntityAddress:
@@ -59,6 +60,7 @@ components:
                   type: string
                 sliceScope:
                   type: array
+                  uniqueItems: true
                   items:
                     $ref: 'TS28541_NrNrm.yaml#/components/schemas/Snssai'
                 qMCConfigFile:
@@ -67,6 +69,7 @@ components:
                   $ref: 'TS28623_TraceControlNrm.yaml#/components/schemas/traceReference-Type'
                 availableRANqoEMetrics:
                   type: array
+                  uniqueItems: true
                   items:
                     type: string
                     enum:
diff --git a/OpenAPI/TS28623_SubscriptionControlNrm.yaml b/OpenAPI/TS28623_SubscriptionControlNrm.yaml
index f077c875dd5aeb2ea22dd609424e155a8e1b4b49..4e8a470a1a9c76a6141caf87eba34ffa344b9c2c 100644
--- a/OpenAPI/TS28623_SubscriptionControlNrm.yaml
+++ b/OpenAPI/TS28623_SubscriptionControlNrm.yaml
@@ -57,6 +57,7 @@ components:
                   $ref: 'TS28623_ComDefs.yaml#/components/schemas/Uri'
                 notificationTypes:
                   type: array
+                  uniqueItems: true
                   items:
                     $ref: 'TS28623_ComDefs.yaml#/components/schemas/NotificationType'
                 scope:
diff --git a/OpenAPI/TS28623_ThresholdMonitorNrm.yaml b/OpenAPI/TS28623_ThresholdMonitorNrm.yaml
index 84e95a94a738be33ec6ecc3d884f88d1ea3cefdf..d456e046f8ea371a704f6093792d01e78b8c9931 100644
--- a/OpenAPI/TS28623_ThresholdMonitorNrm.yaml
+++ b/OpenAPI/TS28623_ThresholdMonitorNrm.yaml
@@ -31,6 +31,7 @@ components:
       properties:
         performanceMetrics:
           type: array
+          uniqueItems: true
           items:
             type: string
         thresholdDirection:
@@ -66,6 +67,7 @@ components:
                   $ref: 'TS28623_ComDefs.yaml#/components/schemas/OperationalState'
                 thresholdInfoList:
                   type: array
+                  uniqueItems: true
                   items:
                     $ref: '#/components/schemas/ThresholdInfo'
                 monitorGranularityPeriod: