diff --git a/OpenAPI/TS28318_DsoNrm.yaml b/OpenAPI/TS28318_DsoNrm.yaml
index 7246dca06f5339830621ae57777da15147215f37..1e03987dc7056d1e719e6b3603ec41e23433db09 100644
--- a/OpenAPI/TS28318_DsoNrm.yaml
+++ b/OpenAPI/TS28318_DsoNrm.yaml
@@ -47,11 +47,13 @@ components:
             dsoRapidInterventionDuration:
               type: integer
             mnoInterventionTime:
-              $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTime'
+              $ref: 'TS28623_ComDefs.yaml#/components/schemas/DateTimeRo'
             mnoInterventionDuration:
               type: integer
+              readOnly: true
             mnoMaxServiceDuration:
               type: integer
+              readOnly: true
             affectedArea:
               $ref: '#/components/schemas/EnergyServiceLocation'
             isAffectedAreaPriority: