diff --git a/OpenAPI/TS28104_MdaNrm.yaml b/OpenAPI/TS28104_MdaNrm.yaml
index 2405f576f7c43ba13dd93224ce810041e239ff79..8aefa574de04acc1121c2ea6e7d2fad117c641a2 100644
--- a/OpenAPI/TS28104_MdaNrm.yaml
+++ b/OpenAPI/TS28104_MdaNrm.yaml
@@ -65,7 +65,7 @@ components:
       type: object
       properties:
         mDAType:
-          type: string
+          $ref: '#/components/schemas/MDAType'
         mDAOutputIEFilters:
           type: array
           uniqueItems: true
diff --git a/OpenAPI/TS28104_MdaReport.yaml b/OpenAPI/TS28104_MdaReport.yaml
index 1ac30cb8169f82d05edda71add0057b88a54a855..188c222d2a12544d7c62ccd249542459101116b4 100644
--- a/OpenAPI/TS28104_MdaReport.yaml
+++ b/OpenAPI/TS28104_MdaReport.yaml
@@ -19,8 +19,7 @@ components:
       type: object
       properties:
         mDAType:
-          type: string
-          readOnly: true
+          $ref: 'TS28104_MdaNrm.yaml#/components/schemas/MDAType'
         mDAOutputList:
           type: array
           uniqueItems: true