filter out returned contact on Identify account screen in the IC

We are upgrading from CRM 5.0 to 7.0. In 5.0 I was able to filter out some of the contacts returned in the interaction center after doing a search in 5.0 by altering method GET_RESULT_TABLE of CL_BUIL_HEADER

In 7.0, I'm having a couple of issues. When I search on has contact person, the first time I return the correct BP's. After my code has filtered, but then if I change relationship type to all, My filtering code is not called and everything is returned. I can then go back to contact person search and my filtering code is never called. I have tried a number of places and I'm not having any luck. Any ideas?

Thanks.

Cathy