An affidavit which has any addition, alteration or erasure is not to be used without leave of the Court unless –

(a) in the case of an addition or alteration, it is authenticated by the initials of the person before whom the affidavit is taken; or

(b) in the case of an erasure, the words or figures appearing at the time of taking the affidavit that are to be erased are rewritten and signed, or initialled, in the margin by the person before whom the affidavit is taken.