so you also have NGM for V4?  or are you trying to use NGM Petite with NGM for GND4?  or are you working with an advanced copy of NGM Petite for GND4? 

and kudos for figuring this all out.  some of the Petite presets are supposed to be used with other full body morphs, though i'm really less sure about their relationship.  i think it's all in the chest, but not being at my Poser computer, can't verify that.