Without a contractual warranty catalogue the buyer relies on statutory warranty alone.
Statutory warranty under ABGB and UGB is only partly tailored to a company acquisition. It often does not capture balance sheet risks, additional tax claims or legacy risks in the desired way. An independent warranty catalogue expressly governs which features of the company the seller stands in for.
Agree a warranty catalogue with clear legal consequences before signing. Only it protects the buyer against hidden risks of the target company.