diff --git a/OpenAPI/TS28105_AiMlNrm.yaml b/OpenAPI/TS28105_AiMlNrm.yaml
index ce3c27250d9150d74dcfced44fecc41f89c6a58f..202b6b2248a337fe02fd965338f14f7919129dbd 100644
--- a/OpenAPI/TS28105_AiMlNrm.yaml
+++ b/OpenAPI/TS28105_AiMlNrm.yaml
@@ -177,7 +177,9 @@ components:
                       type: number
                       format: float
                     trainingRequestSource:
-                      $ref: 'TS28623_ComDefs.yaml#/components/schemas/Dn'
+                      oneOf:
+                      - type: string
+                      - $ref: 'TS28623_ComDefs.yaml#/components/schemas/Dn'
                     requestStatus:
                       $ref: '#/components/schemas/RequestStatus'
                     expectedRuntimeContext: