Supreme Court rules employer user is not a party in social security disputes over temporary agency contracts.

The Supreme Court resolved a legal question regarding whether an employer user must participate in social security disputes involving temporary agency contracts. The Social Insurance Institution argued that the employer user should be summoned as a concerned party, while the plaintiffs claimed the employer user was their actual employer. The court held that the employer user is not a party to such disputes because the legal relationship exists solely between the worker and the temporary agency, preventing dual employment status.