Insufficient Privilege in Data Preview of Attribute View

I am really new to HANA world and using the hanatrial.ondemand.com.

I try creating an attribute view joining data from table SWND_PD and SWND_BPA under catalog EPMSAMPLEDATA.

After activating the view, I try to display data; however, it shows me Error: SAP DBTech JDBC: [258]: insufficient privilege: Not authorized.

How can I assign the authorization to be able to view data from tables under the catalog EPMSAMPLEDATA?

Thanks and Best regards,