Kernrechtsfrage
Whether the cantonal order allowing a late duplika is separately appealable.
Extrahierter Entscheid
The order is an interim decision that is only separately challengeable if it causes irreparable harm; that condition was not met.
Extrahierte Begründung
Accepting the late duplika causes no irreparable disadvantage because the court can still assess its relevance in the final judgment, and any final judgment remains appealable. The minor prolongation of proceedings does not amount to legally relevant delay.