Key legal question
Whether the complaint period in debt enforcement matters could be extended so the appellant could submit the substantiation later.
Extracted holding
The complaint deadline is a peremptory deadline and may only be extended in the limited situations provided by law; the appellant's request was therefore inadmissible.
Extracted reasoning
Under Art. 19(1) SchKG the time limit is forfeitory, so a later supplemental brief cannot be considered. Extension is only possible for parties abroad or those to be served by public notice under Art. 33(3) SchKG; no other extension ground exists.