Questione giuridica chiave
Whether the appeal against the joinder order was admissible under Art. 93 LTF
Decisione estratta
The appeal was inadmissible because the challenged decision was incidental and the appellant failed to show that immediate review would avoid a long and costly evidentiary procedure.
Motivazione estratta
An order admitting joinder is an incidental decision; it causes no irreparable harm. Admissibility under Art. 93(1)(b) LTF requires the appellant to demonstrate that quashing the order would avoid lengthy and costly proceedings, which was not done here.