diff --git a/OpenAPI/TS28111_FaultNrm.yaml b/OpenAPI/TS28111_FaultNrm.yaml
index 7a525d13f635f975e14c2f0b5dd108cae8f18e59..53fc292f0a36b0e257c3fcc61fc454bcc8852d57 100644
--- a/OpenAPI/TS28111_FaultNrm.yaml
+++ b/OpenAPI/TS28111_FaultNrm.yaml
@@ -40,6 +40,7 @@ components:
         - PHYSICAL_VIOLATION
         - SECURITY_SERVICE_OR_MECHANISM_VIOLATION
         - TIME_DOMAIN_VIOLATION
+      readOnly: true  
     ProbableCause:
       description: >-
         The value of the probable cause may be a specific standardized string, or any
@@ -58,12 +59,17 @@ components:
                 - PROBABLE_CAUSE_003
                 - PROBABLE_CAUSE_004
                 - PROBABLE_CAUSE_005
+              readOnly: true  
             - type: string
+              readOnly: true 
         - type: integer
+          readOnly: true 
     SpecificProblem:
       oneOf:
         - type: string
+          readOnly: true 
         - type: integer
+          readOnly: true 
     PerceivedSeverity:
       type: string
       enum:
@@ -72,9 +78,10 @@ components:
         - MAJOR
         - MINOR
         - WARNING
-        - CLEARED
+        - CLEARED  
     TrendIndication:
       type: string
+      readOnly: true
       enum:
         - MORE_SEVERE
         - NO_CHANGE
@@ -87,9 +94,9 @@ components:
         high:
           oneOf:
             - type: integer
-            - $ref: 'TS28623_ComDefs.yaml#/components/schemas/Float'
+            - $ref: 'TS28623_ComDefs.yaml#/components/schemas/FloatRo'
         low:
-          $ref: 'TS28623_ComDefs.yaml#/components/schemas/Float'
+          $ref: 'TS28623_ComDefs.yaml#/components/schemas/FloatRo'
     ThresholdLevelInd:
       oneOf:
         - type: object
@@ -105,12 +112,14 @@ components:
       properties:
         observedMeasurement:
           type: string
+          readOnly: true
         observedValue:
           type: number
+          readOnly: true
         thresholdLevel:
           $ref: '#/components/schemas/ThresholdLevelInd'
         armTime:
-          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTime'
+          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTimeRo'
       required:
         - observedMeasurement
         - observedValue
@@ -118,7 +127,7 @@ components:
       type: object
       properties:
         sourceObjectInstance:
-          $ref: 'TS28623_ComDefs.yaml#/components/schemas/Dn'
+          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DnRo'
         notificationIds:
           type: array
           items:
@@ -145,15 +154,15 @@ components:
         # alarmId:
         #  $ref: '#/components/schemas/AlarmId'
         objectInstance:
-          $ref: 'TS28623_ComDefs.yaml#/components/schemas/Dn'
+          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DnRo'
         notificationId:
           $ref: 'TS28623_ComDefs.yaml#/components/schemas/NotificationId'
         alarmRaisedTime:
-          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTime'
+          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTimeRo'
         alarmChangedTime:
-          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTime'
+          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTimeRo'
         alarmClearedTime:
-          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTime'
+          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTimeRo'
         alarmType:
           $ref: '#/components/schemas/AlarmType'
         probableCause:
@@ -165,7 +174,7 @@ components:
         backedUpStatus:
           type: boolean
         backUpObject:
-          $ref: 'TS28623_ComDefs.yaml#/components/schemas/Dn'
+          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DnRo'
         trendIndication:
           $ref: '#/components/schemas/TrendIndication'
         thresholdinfo:
@@ -178,34 +187,36 @@ components:
           $ref: 'TS28623_ComDefs.yaml#/components/schemas/AttributeNameValuePairSet'
         proposedRepairActions:
           type: string
+          readOnly: true
         additionalText:
           type: string
+          readOnly: true
         additionalInformation:
           $ref: 'TS28623_ComDefs.yaml#/components/schemas/AttributeNameValuePairSet'
-
         rootCauseIndicator:
           type: boolean
-
+          readOnly: true
         ackTime:
-          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTime'
+          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTimeRo'
         ackUserId:
           type: string
         ackSystemId:
           type: string
         ackState:
           $ref: '#/components/schemas/AckState'
-
         clearUserId:
           type: string
         clearSystemId:
           type: string
         serviceUser:
           type: string
+          readOnly: true
         serviceProvider:
           type: string
+          readOnly: true
         securityAlarmDetector:
           type: string
-
+          readOnly: true
     AlarmList-Single:
       allOf:
         - $ref: 'TS28623_GenericNrm.yaml#/components/schemas/Top'
@@ -220,8 +231,9 @@ components:
                   $ref: 'TS28623_ComDefs.yaml#/components/schemas/OperationalState'
                 numOfAlarmRecords:
                   type: integer
+                  readOnly: true
                 lastModification:
-                  $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTime'
+                  $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTimeRo'
                 alarmRecords:
                   description: >-
                      This resource represents a map of alarm records.
@@ -230,7 +242,7 @@ components:
                   additionalProperties:
                     $ref: '#/components/schemas/AlarmRecord'
                 unreliableAlarmScope:
-                  $ref: 'TS28623_ComDefs.yaml#/components/schemas/Dn'
+                  $ref: 'TS28623_ComDefs.yaml#/components/schemas/DnRo'
 
 
   #---- Definition of alarm notifications --------------------------------------------#
@@ -539,7 +551,7 @@ components:
       type: object
       properties:
         commentTime:
-          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTime'
+          $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTimeRo'
         commentUserId:
           type: string
         commentSystemId:
diff --git a/OpenAPI/TS28623_ComDefs.yaml b/OpenAPI/TS28623_ComDefs.yaml
index ff9c3735d245f4ef71a802ff0830e321faf5a3f4..0467bd8099e38d846884f6c704ff836170b67ac4 100755
--- a/OpenAPI/TS28623_ComDefs.yaml
+++ b/OpenAPI/TS28623_ComDefs.yaml
@@ -381,9 +381,9 @@ components:
         Jex advanced profile specified in clause 7.5 of TS 32.161.
     SystemDN:
       type: string
-
     NotificationId:
       type: integer
+      readOnly: true    
     NotificationType:
       oneOf:
         - $ref: 'TS28111_FaultNrm.yaml#/components/schemas/AlarmNotificationTypes'