How to display or bind properly WithAdministrativeData(created/changed date) in the owl sap bydesign

Hello, Guys.

pretty newbies question thing. I've declared WithAdministrativeData in front of my custom BO.

And I'd like to display the creation date-time, and the changed one on the owl.

initially, they couldn't show anything. but after clicked the record, then showed data.

when I've tried bound data field they couldn't get data even after clicked.

so I've bound below a data structure each.

for more details, attached screenshots. many thanks in advance.