Kernrechtsfrage
Whether the appeal should be admitted despite non-payment of the court cost advance within the set deadline.
Extrahierter Entscheid
The court did not enter into the appeal because the required advance was not paid within the non-extendable grace period.
Extrahierte Begründung
The appellant was warned that failure to pay would lead to non-entry under Art. 62(3) BGG; the payment was still not made, and the notice was deemed served on 20 February 2013 under Art. 44(2) BGG.