Question juridique clé
Whether the letter of 20 December 2007 could be treated as an appeal against the incidental decision of 16 November 2007.
Solution extraite
The writing was merely a communication confirming payment and did not express an intention to appeal; it was therefore manifestly inadmissible as an appeal.
Motifs extraits
The appellant only stated that the requested CHF 12 had been paid. Since no intent to challenge the incidental decision was manifested, the filing could not qualify as a valid appeal under Art. 108 al. 1 let. a LTF.