Key legal question
Whether the appeal against the interlocutory order was admissible under Art. 93 BGG due to irreparable harm.
Extracted holding
The appellant failed to show a legally irreparable harm; the order could be challenged after the final judgment if it affected the outcome.
Extracted reasoning
The alleged disadvantage was only procedural and contingent, since the impact of the excluded rejoinder could only be assessed in the future merits judgment. Any later prejudice could be cured by appeal against the final decision, including correction of the facts or remittal. Delay or increased costs do not constitute irreparable legal harm.