Supreme Court judgment of 15 January 2020, case file III PK 206/18 

Assenting to rules and regulations does not constitute a contract between an employer and trade unions. The employer proposes the draft version thereof while the trade union organizations express their stance on that document or they refrain from exercising that right. This procedure must be observed for rules and regulations to take force. The only thing that can block the enactment of rules and regulations proposed by an employer is a joint negative stance expressed in a single written document by all of the trade union organizations, or at least by representative trade union organizations.

The ruling is discussed by Katarzyna Sarek-Sadurska.