The Missing 3.1.4 Modules Disk for the Amiga 4000 isn't needed when you use Kickstart ROM 3.1.4.
This disk is only needed when you using an Amiga 4000 with kickstart Rom 3.1.
I also upgraded my Amiga 4000 with Kickstart ROM 3.1.4. I did'nt get the request to insert 3.1.4 Modules Disk.