Question juridique clé
Whether the cantonal court applied Swiss law instead of the German law designated by private international law
Solution extraite
The complaint was unfounded; the appellants did not show that Swiss law had been applied instead of German law, but only contested the way German law was applied.
Motifs extraits
In a monetary dispute, the appeal can only address misapplication of foreign law insofar as Swiss conflict rules were violated. The cantonal court relied exclusively on German statutory provisions, commentary, and case law; the alleged failure to mention specific German provisions did not establish a conflict-law error.