Questão jurídica principal
Whether the cantonal court could refuse to hear the social-insurance appeal because it was not supplemented within the deadline.
Decisão extraída
No. The original appeal satisfied the minimum statutory requirements, so the court had to decide the merits.
Fundamentação extraída
A supplementary deadline may only lead to non-entry if the filing initially fails to meet minimum requirements. Where those requirements are already met, making merits review dependent on an additional supplement constitutes a denial of justice and excessive formalism.