The following schema file is empty:
https://forge.etsi.org/rep/nfv/api-tests/blob/master/SOL003/VNFLifecycleManagement-API/schemas/vnfLcmOperationOccurrenceNotification.schema.json
The definition should be the one available at:
https://forge.etsi.org/rep/nfv/SOL002-SOL003/blob/v2.4.1/src/SOL002/VNFLifecycleManagementNotification/definitions/VNFLifecycleManagementNotification_def.yaml