The National Commissioner of the South African Police Service sought a declaratory order in the High Court that regulation 24(6) of the SAPS Employment Regulations conferred a discretion on him to decide whether, after a post had been upgraded, the incumbent employee could be retained in the higher-graded post without advertising it. Regulation 24(6) provides that the Commissioner 'may' continue to employ the incumbent without advertising if certain requirements are met. The High Court granted the declarator. The Public Servants Association, a registered trade union representing public servants, appealed to the Supreme Court of Appeal, contending that regulation 24(6) imposed a duty, not a discretion, to retain a satisfactorily performing incumbent in an upgraded post.