diff --git a/OpenAPI/TS28623_MnSRegistryNrm.yaml b/OpenAPI/TS28623_MnSRegistryNrm.yaml
index 299cca6577d39d78d907a77f83b37277a17eecc3..b4e8c68e3d4cb5640e0aa37a495ca8cf92f3783c 100644
--- a/OpenAPI/TS28623_MnSRegistryNrm.yaml
+++ b/OpenAPI/TS28623_MnSRegistryNrm.yaml
@@ -39,10 +39,8 @@ components:
           properties:
              mnsLabel:
                type: string
-               readOnly: true
              mnsType:
                type: string
-               readOnly: true 
                enum:
                  - PROV_MNS
                  - FAULT_SUPERVISION_MNS
@@ -50,7 +48,6 @@ components:
                  - FILE_DATA_REPORTING_MNS
              mnsVersion:
                type: string
-               readOnly: true
              mnsAddress:
                description: Resource URI as defined in the relevant Technical Specification
                $ref: 'TS28623_ComDefs.yaml#/components/schemas/UriRo'
@@ -63,7 +60,7 @@ components:
                type: array
                uniqueItems: true
                items:
-                 $ref: 'TS28623_ComDefs.yaml#/components/schemas/DnRo'
+                 $ref: 'TS28623_ComDefs.yaml#/components/schemas/Dn'
                minItems: 1
 
 #-------- Definition of YAML arrays for name-contained IOCs ----------------------