restrict values from query selection.

Hi everybody.

I had a problem with queries. I need that users can only see data that they are authorizated to see. We are restricting by society... Can I modify infoset to do this?. The ideal thing for me would be introduce some code ( an AUTHORITY-CHECK ) in AT SELECTION-SCREEN event and can control bukrs selection option. But I cant select this event. Any idea?. I am working with 4.6 c version

Thakx.

Miguel.