DCR's...What are the good for?

Well after a successful import of key fields and one data field from db2 I am left dumbfounded. Are DCRS only good for initial import of records? If I make and update on either end(Lotus or Db2) is that change migrated to the other end? I have tried it both ways I am not getting any errors but I am not getting any changes either. Also when I update the notes record as soon as I hit the save button the key field clears out(data still there but field goes blank)??? This is going to confuse the heck out of my users. Any help???

Thanks,

Tom