Questione giuridica chiave
Whether X. had standing to bring the civil-law appeal and subsidiary constitutional complaint against the cantonal non-entry decision.
Decisione estratta
X. lacked a legally protected interest because the challenged non-entry decision did not worsen his legal position; the contested claim remained collocated and the respondent could still pursue liability claims.
Motivazione estratta
The cantonal ruling changed nothing compared with the first-instance judgment, which X. had not appealed. The respondent remained a bankruptcy creditor either way, so no additional legal detriment resulted. The same applied from the estate’s perspective.