The state of the isisManAreaAddrEntry. If the
isisSysAdminState for this Intermediate System is 'on' and
an attempt is made to set this object to the value
'destroy' or 'notInService' when this is the only
isisManAreaAddrEntry in state 'active' for this
Intermediate System should return inconsistentValue.
A row entry cannot be modified when the value of this
object is 'active'.