During the day to day running of a company there may be times where your manager requires you to perform certain functions that fall out of the scope of your job description. This may happen once or twice without it being an issue but what happens when this is now a regular and constant feature of the employment relationship?
The Labour Appeal Court in Mazista Tiles (Pty) Ltd v National Union of Mineworkers and Others held that, “An employer who is desirous of effecting changes to terms and conditions applicable to his employees is obliged to negotiate with the employees and obtain their consent. A unilateral change by the employer of the terms and conditions of employment is not permissible.”
In a Nutshell: You may perform certain duties that are not contained in your Job Description however when the duties constitutes a change in the terms of employment, the employer may be prevented from implementing the changed terms or be required to restore the terms prior to the change.