Key legal question
Whether the appeal had to be entered into despite non-payment of the required advance on costs.
Extracted holding
No. Because the appellants failed to pay the advance on costs even within the extended deadline, the appeal could not be entered into.
Extracted reasoning
Under Art. 62(3) BGG, non-payment of the advance on costs after expiry of the extended deadline leads to non-entry in the simplified procedure under Art. 108(1)(a) and (2) BGG.