Question juridique clé
Whether the appeal against the cantonal cost advance order was admissible under Art. 93 BGG without irreparable harm.
Solution extraite
The cost advance order was an interim decision, and no irreparable legal disadvantage was shown because the cost issue could still be raised in an appeal against a possible final non-entry decision.
Motifs extraits
An appeal against an interim decision is only admissible if it can cause irreparable harm. Here, the appellant could later challenge a cantonal final non-entry decision and also contest costs in that context; therefore no irreparable harm existed, and the appellant did not sufficiently allege otherwise.