diff --git a/src/SOL002/VNFFaultManagement/definitions/SOL002VNFFaultManagement_def.yaml b/src/SOL002/VNFFaultManagement/definitions/SOL002VNFFaultManagement_def.yaml
index e2b4c336a9238af2f9a5b3915c338e8d6abc8b81..716f5924499515cbf1d66952281b8fddf89b2b9c 100644
--- a/src/SOL002/VNFFaultManagement/definitions/SOL002VNFFaultManagement_def.yaml
+++ b/src/SOL002/VNFFaultManagement/definitions/SOL002VNFFaultManagement_def.yaml
@@ -9,6 +9,8 @@ definitions:
     required:
       - id
       - managedObjectId
+      - vnfcInstanceIds
+      - rootCauseFaultyResource
       - alarmRaisedTime
       - ackState
       - perceivedSeverity
@@ -51,12 +53,6 @@ definitions:
           Time stamp indicating when the alarm was cleared. It shall be
           present if the alarm has been cleared.
         $ref: "../../../definitions/SOL002SOL003_def.yaml#/definitions/DateTime"
-      alarmAcknowledgedTime:
-        description: >
-          Time stamp indicating when the alarm was
-          acknowledged. It shall be present if the alarm has
-          been acknowledged.
-        $ref: "../../../definitions/SOL002SOL003_def.yaml#/definitions/DateTime"
       ackState:
         description: >
           Acknowledgement state of the alarm.