Federico Alzamora Previtali

Right, what it means is that the motion on a passive zone in 6DOF will not be based on forces/moments calculations on THAT zone, but will be coupled to the motion assigned to the zone (in your case "translation"). 

In other words, you want 6DOF model to compute forces and moments on the moving boundary zone to set its motion and you want the adjacent inflation layer cell zone to follow this motion, while ignoring any forces/moments acting on this cell zone.

I hope this clears it up!