To edit an existing HumanIK skeleton definition
to unlock the current skeleton definition.
Maya LT Extension 3Maya 2016 Extension 2 includes a HumanIK roll bone system that lets you map up to five roll bones per limb. If your existing skeleton definition has roll bones defined, and was created using an earlier version of
Maya LT, unlocking the skeleton definition removes the roll bone assignment, letting you map bones using the roll bone views in the
Definition tab window. See
Character and Name Match views.