Oral agreements and German law

Questioner

Is an oral agreement legally valid in Germany?

Questioner

If Dutch law applies to that agreement, in principle yes (unless there's a special agreement for which Dutch law requires it to be in writing). If German law applies to that agreement, and it's likely that it does, you should consult a specialist familiar with German law.

Questioner

In principle, this is possible under German law. If you buy a cheese sandwich at Leen Bakker, it's essentially a verbal agreement. But for specific agreements, a written or, even better, a notarial agreement is required. So please explain what type of agreements are involved.