2015/51 An order to perform other work can constitute harassment, even if the work falls within job description (CZ)
The employer is authorised to assign work that is within the agreed type of work set out in the employment contract to employees, in accordance with the employer’s needs. However, at the same time, the exercise of this right must not be used to intimidate the employee in ‘revenge’ for the employee having defended his or her rights previously.
Nejvyšší soud (Czech Supreme Court), 2015-01-21