User Authorizations Table

Hello Experts,

I need to make a query on users authorization rights, when I go the authorizations screen via Administration>System Initialization>Authorizations>General Authorizations the system information view display SUB_NAME as a column of OPRM table used by the Authorizations window.

The problem is when I try to query the OPRM table SAP returns message "Invalid Object Name".

WHY?

If this is a normal case, is there another way to have a report on user module rights?

Thanks.