It worked for me this morning (entering K3 data in TT). As far as I understand it, if you are not filing tax form 1116 (foreign tax credit) TT may not prompt you for the K3 info. For each K1 entry requiring K3 entry, I had to go back through each one and reconfirm all my previous inputs before TT prompted me to enter K3 data.
The Feds "accepted" my e-filed return so I guess whatever I entered for K3 data was sufficient.
