We use the Gift Code field for all of our incoming gifts and this is not yet available in NXT. It means we cannot use the NXT donation forms and our automated recurring batches require a query and global change (and some manual changes) in the DB view before posting to the general ledger.
We also use the Gift Code field for all incoming gifts. It is used to pull our recurring gift batches for standing orders and direct debits. We too are unable to add gifts via NXT or use NXT donation forms until this becomes available.