How to chage Roster Display names in Openfire

We currently are using Openfire in our environment and successfully querying with LDAP. Because we have well over 100 users in our Domain that utilize Pidgin for IM, we have to separate our users into 2 groups. ie. IM_AthruM and IM_NthruZ We have been able to set filters within the LDAP query and are able to populate the groups within Pidgin clients as well. No problems…

However, all the users that show up on the client interface buddy list are being displayed in a “FIRST LAST” name display. We want to have the buddy list display a “LAST, FIRST” name.

I have tried to set a filter do change the display to {sn}, {givenName} as I am positive that this information is recorded in AD. However, I am not sure what field I am supposed to change… is it the ldap.vcard-mapping? Is it the ldap.nameField? Twice I have tried to make this change and have broken the login for both the Admin Console and for all clients…

Has anyone done this without an issue???

Thank you!!!