Setting this MIB object will cause the settings of the
rlPhdStackOrderDesiredUnitPosition MIB object instances to take effect.
After setting this MIB object and until a further change
of at least one instance of the rlPhdStackOrderDesiredUnitPosition object,
the values of the rlPhdStackOrderCurrentUnitPosition objectinstance and
the corresponding rlPhdStackOrderDesiredUnitPosition object instance
will be the same.