(1) Where it appears to:
(a) a summary authority, before dealing with or trying a charge or at any stage of dealing with or trying a charge; or
(b) the Director of Military Prosecutions, at any stage when a charge is before him or her under section 103; or
(c) the judge advocate of a court martial, before the court martial tries a charge or at any stage of the trial of a charge; or
(d) a Defence Force magistrate, before trying a charge or at any stage of trying a charge;
that, for any reason, the charge should be amended, the summary authority, Director of Military Prosecutions, judge advocate or Defence Force magistrate, as the case may be, shall make such amendment of the charge as he or she thinks necessary unless the amendment cannot be made without injustice to the accused person.
(2) In subsection (1), amendment includes the addition of a charge or the substitution of a charge for another charge.