Customize the Search engine in Oracle iprocurement

Hello all,

     We souce items   internally through iprocurement

   My client would like to restrict the search results for inventory items by inventory organization and not operating unit( current design). One way of doing this would be to restrict the results by looking at the the internal location and the inventory organization it is assigned to in the iprocurement users preferences. This would require a customization.Oracle support say it can be done but our developers are not very keen on doing this as they will be impacting base code. Anyone out there have any thoughts on this or implemeneted this type of customization.