Here's the way the hierarcy works:

Runtime -> Libraries -> Pose -> DAZ Mats and Poses -> DAZ's Victoria 4 -> Morph Injections -> Base

                 -> Morphs ++

                 -> Inj Base V4

                 -> Inj Morphs ++ V4

This is the exact same structure that exists for the K4 morphs, but I'm not having any trouble with them.

Go figure!