Odata service with error: Service exception: insufficient privilege

Dear friends,

       I am trying develop in HANA trail cloud system. When I create Odata service to consume my analytic view or calculation view, it have this error message:

my Odata service code:

it feel awful when you learn hana in trail, it always have many privilege problem, it was very frustrating!

one more question about Odata, how do we define the input parameters in Odata  for the view we consume which already have input parameters?

Thanks for your sincerely answer.

Regards,

Zhang