In sentencing a person convicted of a federal offence, a court must have regard to:
(a) any sentence already imposed on the person by the court or another court for any other federal offence or for any State or Territory offence, being a sentence that the person has not served; and
(b) any sentence that the person is liable to serve because of the revocation of a parole order made, or licence granted, under this Part or under a law of a State or Territory.