The ability to grant object-level permissions at the proxy table level is not implemented in this release of SAP Control Center. You can, however, grant these permissions at the user or role level.
This means that you cannot grant proxy table permissions to multiple users and roles at the same time. They must be granted one user or role at a time.
Follow the steps under Role-Based Table and Column Permissions to grant and revoke proxy table object level permissions. Alternately, at the SQL level, you can execute a GRANT object-level permissions statement.