POBEE ALIAS ARKO v. THE REPUBLIC Criminal law and procedure—Plea of guilty—Change to lesser offence—Where appropriate—Accused first pleading "not guilty" to charge of attempted murder—Subsequent application by accused under Act 30, s. 239 (2) for change of plea of "guilty" to a lesser offence of causing harm—Circumstances allowing change of plea from "not guilty" to offence charged to a plea of "guilty" to some other offence not charged—Criminal Procedure Code, 1960 (Act 30), s. 239 (2).