For the most part, TRUST THE SOFTWARE.

If you have either a long term or short term transaction reported WITH BASIS they do not need to go to form 8949. That is why your first transaction (and potentially a whole bunch of transactions) should show up as a total of all long (8a) or short (1a) transactions. Those without basis MUST show up on 8949. 

You can FORCE everything to 8949 if you have a picky client that wants to see every transaction, but IRS doesn't care. The brokerage already told them, so there is no need to repeat it.