Kernrechtsfrage
Whether the cantonal court acted arbitrarily by granting definitive legal opening despite the debtor's bank receipts and alleged set-off claims.
Extrahierter Entscheid
No. The bank statement showed payments, but not that they satisfied the debt in enforcement; the allocation of payments to later maintenance obligations was not arbitrary.
Extrahierte Begründung
Under Art. 81(1) SchKG, the debtor must prove with clear documents that the specific enforced debt was extinguished after the enforceable judgment. The bank list contained dates and amounts only, without clear allocation to the debt in question. For alleged overpayments from earlier periods or double payments, a set-off claim based on unjust enrichment was not documented with sufficient clarity.