Hi,
To add more details: RSCSAUTH is good method because, When you choose "Save", the customer-specific authorization groups for all SELECTED reports are copied into Table TRDIR and not the other way around.
The authorization groups for each report are also entered in Table SREPOATH. This is to allow you to restore customer-specific authorization groups following an upgrade by running RSCSAUTH again.
I hope this answers Ashish Vikas question above.
Thank you.