Enhance the functionality of 'Search' event handler in Account workcenter

Hi Experts I am new to SAP CRM Web UI. I have a project to enhance the CRM web ui account management. Requirement is whenever some one search the account details without specifying " ROLE" then result should contain 'ship-to-party' and 'bill-to-party' otherwise if user specify the "ROLE" in search criteria then it should work normally. Many thanks in advance . Regards Rav Singh