I cannot promise where Section 338 belongs, that is a question for CBP and your ABI provider, but the gap is familiar. My best guess would put the 9903.03.12/.13/.14 lines ahead of the Chapter 1–97 classification. That is a guess, not a confirmed sequence.
We would not act on an unconfirmed placement either. An unactivated TARIC additional code here simply refuses the declaration, so nothing moves until the corrected act lands. If your system would accept a placement CBP has not confirmed, I would still treat it as provisional.
