Question juridique clé
Whether the signed invoice constituted a provisional debt acknowledgment under Art. 82 SchKG.
Solution extraite
The document only confirmed receipt and installation of the door; it did not clearly and unconditionally acknowledge a payment obligation.
Motifs extraits
A debt acknowledgment requires an unambiguous will to pay a certain sum. The signed delivery/invoice document served to confirm performance, not to create a separate promise to pay.