What is leading, the Balanced Labor Market Act or the Collective Labor Agreement for Butchers?

Questioner

My son has a 0-hour contract of limited duration (1 year) at a butcher's shop as of 9-1-2021. He wants to cancel and now has a conflict about the notice period. According to the WAB, he has a notice period of 4 days and this is his preference. His employer says that he must adhere to the applicable notice period of 1 month from the CAO, which starts at the end of the month. What is leading?

Lawyer

The notice period agreed upon in the employment contract/collective labor agreement is decisive. Perhaps your son can still take outstanding vacation days?

Questioner

The case has taken a strange turn. The employer himself has sought legal advice and his lawyer has told him that the WAB is leading and my son is entitled to a notice period of 4 days. My son got his way, but the matter remains in doubt, especially because of the advice above…