Key legal question
Whether the appeal against the incidental ruling was admissible under Art. 93 para. 1 let. b LTF.
Extracted holding
The appellant did not show that an immediate decision on the merits would avoid a long and costly evidentiary procedure.
Extracted reasoning
The submission merely asserted in a few lines that expert evidence and a counter-expertise would be needed; this was too cursory, and the alleged complexity and cost were not demonstrated. The burden lies on the appellant to establish the cumulative conditions of Art. 93 para. 1 let. b LTF.