operation.setOperator(Operator.ADD);
CampaignOperation[] operations = new CampaignOperation[] {operation};
// Validate campaign add operation.
CampaignReturnValue result = campaignValidationService.mutate(operations);
// Display new campaigns, which should be none if the service was a
// validation service.
if (result != null) {
for (Campaign campaignResult : result.getValue()) {