Questione giuridica chiave
Whether the appeal had to be declared inadmissible because the required fee advance instalments were not paid on time
Decisione estratta
Yes. The second, third and fourth instalments were not paid within the fixed deadlines.
Motivazione estratta
Postal confirmations in the file showed non-compliance with the payment deadlines under Art. 48 para. 4 LTF, despite prior warning of inadmissibility.