Z authrozation Group "Showing BP in Hit List"

We are implementing CRM 7 and we have a requirement to block the secured customer's details and we have created authorization groups (enabling only authorized group to view that BP - and agent should not view that BP) when the agent logs in and search for BP with Txcode BP, He gets the BP hit list with BP name , nubmer with Post code when he clicks on BP he gets the message that he is not authorizaed to see the BP details. The problem is : In the hit list the BP can see the POST CODE & NAME. As per my requirement it should not display the hit list also. Can any one help me ,

How to block the secured customer in Hit list also and How to restrict the transactions (service orders/web request) where the Secured BP is involved..

CHANDRA