SOL005_INT_009 : attributes interdependency in "ThresholdModifications"

src/SOL005/NSPerformanceManagement/definitions/SOL005NSPerformanceManagement_def.yaml

@@ -440,6 +440,11 @@ definitions:
       This type represents modifications to a threshold.
       It shall comply with the provisions defined in Table 7.5.2.11-1.
     type: object
+    anyOf:
+      - required:
+        - callbackUri
+      - required:
+        - authentication
     properties:
       callbackUri:
         description: >