Where a question that cannot be settled by negotiation between the parties arises under this Act a certificate from the Coordinator that—
(a) a military member or a police member was acting within the scope of his or her duties or employment; or
(b) a matter in respect of which judgment was given against a member referred to in paragraph (a) arose while he or she was acting within the scope of his or her duties or employment,
is final and conclusive.