Social packages may be specific sources of labor law or have a contractual nature. Whether it is a source of labor law, depends on whether the agreement is based on the law and defines the rights and obligations of the parties of the employment relationship. This assessment can only be given by the court. If, therefore, the social contract has a legislative nature, its interpretation using methods relevant to the interpretation of declarations is incorrect. (SUPREME COURT I PK 270/14).
Poland