Hi,
Thanks all for the answer. I've tried "Correct Structural Inconsistencies" thing and it works like a magic.
Because it is like a magic, I'm just getting paranoid when I reassign a node with children, the children get corrected too right?
I backed up the mapping before updating to multiple mapping, then I re-check some fields from the new mapping (updated to be multiple mapping) with the old backed up mapping (only single mapping).
Because to recheck all of the single fields in the mapping will be tedious. But as long as I check all are correct and the mapping is right for each corresponding field.
Sorry for being paranoid and insecure.
Thank you,
Suwandi C.