diff --git a/OpenAPI/TS28561_NdtNrm.yaml b/OpenAPI/TS28561_NdtNrm.yaml
index 605cb1a97c70fd74489f9ae0f551e9646b593991..eec24638169cefa223404a8951f4fc58bc9fd6d9 100644
--- a/OpenAPI/TS28561_NdtNrm.yaml
+++ b/OpenAPI/TS28561_NdtNrm.yaml
@@ -60,10 +60,6 @@ components:
             $ref: '#/components/schemas/NDTInputDescription'
           nDTJobExecutionRequirements:
             $ref: '#/components/schemas/NdtJobExecutionReqts'
-          collaboratingNDT:
-            description: >-
-              It indicates the related NDT Job contributing as a collaborator to the executed NDT Job. It describes the DN of the collaborated NDT Job
-            $ref: 'TS28623_ComDefs.yaml#/components/schemas/DnListRo'
           nDTReportRefList:
             $ref: 'TS28623_ComDefs.yaml#/components/schemas/DnListRo'
           nDTJobRefList: