diff --git a/TS26510_Maf_Provisioning_ProvisioningSessions.yaml b/TS26510_Maf_Provisioning_ProvisioningSessions.yaml
index 40425b8b20c15c02e489e56895f53f606b1850c7..80ee5f59819ae0f87505c98da4dab34ddc6e01ba 100644
--- a/TS26510_Maf_Provisioning_ProvisioningSessions.yaml
+++ b/TS26510_Maf_Provisioning_ProvisioningSessions.yaml
@@ -136,6 +136,7 @@ components:
       required:
         - provisioningSessionId
         - provisioningSessionType
+        - externalServiceId
         - appId
       properties:
         provisioningSessionId:
@@ -144,6 +145,8 @@ components:
             - $ref: 'TS26510_CommonData.yaml#/components/schemas/ResourceId'
         provisioningSessionType:
           $ref: 'TS26510_CommonData.yaml#/components/schemas/ProvisioningSessionType'
+        externalServiceId:
+          type: string
         aspId:
           $ref: 'TS29514_Npcf_PolicyAuthorization.yaml#/components/schemas/AspId'
         appId:
diff --git a/TS26510_Maf_SessionHandling_ServiceAccessInformation.yaml b/TS26510_Maf_SessionHandling_ServiceAccessInformation.yaml
index 49ffee530e32bd915260f46cdcc63a8521830ff1..334922afaa264a289b8962fced67e72da3a9db99 100644
--- a/TS26510_Maf_SessionHandling_ServiceAccessInformation.yaml
+++ b/TS26510_Maf_SessionHandling_ServiceAccessInformation.yaml
@@ -28,10 +28,10 @@ security:
   - OAuth2AuthorizationCode: []
 
 paths:
-  /service-access-information/{provisioningSessionId}:
+  /service-access-information/{externalServiceId}:
     parameters:
-      - name: provisioningSessionId
-        description: 'The resource identifier of an existing Provisioning Session.'
+      - name: externalServiceId
+        description: 'An external service identifier that uniquely identifies an existing Provisioning Session in this Media Delivery System.'
         in: path
         required: true
         schema:
diff --git a/TS26512_Maf_SessionHandling.yaml b/TS26512_Maf_SessionHandling.yaml
index 47b79d97c14f2f177f7b47d980b5e6e0eb3732e3..631f35f9bbe1c3fc82ad61e1676bb1b771c05d4e 100755
--- a/TS26512_Maf_SessionHandling.yaml
+++ b/TS26512_Maf_SessionHandling.yaml
@@ -45,8 +45,8 @@ components:
 
 paths:
   # Service Access Information API
-  /service-access-information/%7bprovisioningSessionId%7d:
-    $ref: 'TS26510_Maf_SessionHandling_ServiceAccessInformation.yaml#/paths/~1service-access-information~1%7bprovisioningSessionId%7d'
+  /service-access-information/%7bexternalServiceId%7d:
+    $ref: 'TS26510_Maf_SessionHandling_ServiceAccessInformation.yaml#/paths/~1service-access-information~1%7bexternalServiceId%7d'
 
   # Dynamic Policy API
   /dynamic-policies: