In its ruling of 3 March 2021 (Ref. XII ZR 92/19), the Federal High Court of Justice (BGH) continued the previous case law on so-called completeness clauses. The clause “Oral side agreements do not exist.” merely reflects the anyway existing and rebuttable presumption of completeness of the written contract. The party wishing to rely on a deviating oral agreement is free to provide counter-evidence.