Attached Link: http://www.jaager.com

Here is the deal = In a modeling program - if you morph several groups to get a desired shape, it involves moving the verts at the border of two groups. There are two verts at each position - one for each group. Both of these verts, and the ones running up to them must be moved. This means that the same value for the morph must be used for every group involved. Otherwise the seam can split.

You can set each morph in the group by hand to the same value, or you can do it with a controlling dial. If the dial is in Body, it is called a FBM - on an actual figure group = PBM. The difference is where the control is. Daz has set most of these morphs up as both FBM and PBM.
The dial in Body controls one group morph, which in turn, controls all of the others.

Almost every morph in M2 can be set from Body. This makes it very easy. The face morphs, other singleton morphs, and joint fixes are out in real groups.

If you turn a pbm- dial, you are setting a chain out of sequence. I have seen some really screwed up character cr2 files for V1 - where the FBM Fairy has been set on the groups - chest = 0.5 rCollar 0.2 , abdomen 1.0 etc.
Daz has just tried to help you avoid this sort of error by marking the dials that you should set somewhere else.
The author of the morph is just trying to help you to avoid making a hash of his work.