Supreme Court dismisses appeal on social security case, rejecting informal procedure rules for cassation due to missed deadline.

The Supreme Court dismissed the appellant's appeal against a lower court's decision to reject a cassation filed late. The appellant argued that informal procedural rules applicable to labor and social security cases should apply to cassation proceedings, but the lower court had already rejected the request to extend the deadline based on the lawyer's failure to prove non-fault. The Supreme Court held that cassation rules are strict and do not defer to the informal procedures of specialized social security or labor proceedings, thus the late filing was invalid.