Questione giuridica chiave
Whether the appeal against the first-instance evidentiary order was admissible before the final judgment.
Decisione estratta
The complaint was inadmissible because the challenged evidentiary order could be reviewed on appeal against the final judgment and no irreparable or substantial disadvantage was shown.
Motivazione estratta
An evidentiary order is ordinarily reviewable only with the final judgment. Immediate review by complaint is exceptional and requires a risk of irreparable or at least substantial prejudice. The appellant could raise the same objections later, the evidentiary order remained open to revision until final judgment, and costs of the expert evidence would be allocated only then.