Question juridique clé
Whether the appeal against the order granting supplementary expert evidence was admissible
Solution extraite
The appeal was inadmissible because the challenged order could not cause irreparable harm and the party could later contest the probative value of the expert report in the merits proceedings.
Motifs extraits
An order admitting supplementary expertise is an interlocutory decision appealable only if it may cause irreparable harm. That condition was not met here.