Authorization for BI Platform (BOBJ Server) access users

Dear Gurus,

I need to know the necessary authorizations that need to be granted to the ERP users who will preview the BOBJ reports, (Crystal Reports, Dashboards, webi, etc)

Note: We need only the specific authorizations for the mentioned above for security reasons.

I found those roles:

Crystal_Designer

Crystal_Entitlement

And they did not work.

BR

Hany Zahran