Can an employee back out of a signed agreement?

There has been a rise in cases where employees try to avoid the consequences of agreements that they have signed, claiming their declarations were flawed. In some situations, employees can even act against the employer’s interests – stating that they are withdrawing from the agreement while keeping the benefits they received, despite violating its terms. Is this legally allowed? Can an employee enter into an agreement with the employer and later back out, claiming they are revoking their declaration? In principle – no. However, there are exceptions to this rule. – Łukasz Chruściel, Anna Kencel comment for Dziennik Gazeta Prawna.

Full article in Polish avialible here.