Where:
(a) a parole order in relation to a person is revoked or cancelled under this Act; and
(b) before the revocation or cancellation, the person had earned under a law of the Territory a period of partial remission of the sentence of imprisonment in respect of which the parole order was made;
the period so earned must, despite this or any other law of the Territory, be deducted from the term of imprisonment that remains to be served as a result of the revocation or cancellation of the parole order.