Upgrade DOORS NG from 6.0.6 to 7.0.2
Accepted answer
Identifiers will be unchanged. Make sure you've updated 6.0.6 to the latest iFix before upgrade, and make sure you put the latest 7.0.2 iFix into your new 7.0.2 installation before upgrading. One reason for this is that the latest iFixes include the latest improvements to the upgrade process, and that's what you want.
Upgrade from SQL Server to DB2 first, get your new server stable, then do the upgrade to 7.0.2.
You should anyway do a trial upgrade i.e. not on your production server but using a clone of production data, which may help you answer questions about the result of upgrading.
HTH
Ian