I recognize this from your other question 🙂
The broker is not reporting the term, that's why it's listed as undetermined. You however are responsible to identify the term. Let's say that there were many small transactions and that's why it's undetermined. You can group the short term ones together with an acquisition date of "VARIOUS" and the long term ones together with an acquisition date of "VARIOUS."
Now you're back on solid ground because you know how to report both long term and short term transactions :-).
