Non LDAP IDs migrated to LDAP

I have an issue with taking an RTC 2.0 server from using non LDAP over to use IBM LDAP (intranet IDs and IBM Blue groups). The old server is using local accounts and local RTC jazzuser, jazzadmin etc.. permissions. I have ran a export to tar an import to a new server that has been configured to use IBM LDAP (intranet IDs and IBM Blue groups). The users can log into the new server with their IBM intranet IDs and have jassuser permissions, all seems great. The issue I have is the over 1000 tasks assigned to the old local users are assigned to them and were not assigned to the new IBM LDAP (intranet IDs) same ID name without the @XX.ibm.com. Is there a simple solution???
I have several teams that have this issue and is stopping us from hosting their environments in a a secure manor.