Question juridique clé
Whether the defendants had to prove compensable hidden reserves to offset the established inventory shortfall.
Solution extraite
Because the buyer proved both the contractual valuation warranty breach and the reduced value of the goods, the defendants bore the burden of proving the alleged hidden reserves as a countervailing performance fact.
Motifs extraits
The party invoking hidden reserves derived rights from that allegation. Under Art. 8 ZGB, the burden lay with the defendants once the inventory shortfall was established; the appellate court's factual findings on the shortfall were binding.