Create Aggregation Relections

try to use " ALTER DATASET* < DATASET_PATH > CREATE AGGREGATE REFLECTION < REFLECTION_NAME > ." but receive error “Not authorized to change SYSTEM options”. What does it mean?

@Mice

Are you able to create the reflection by opening the dataset and via the UI?

how to create by UI?

@Mice

Can you please click on help-about and send us a screenshot?