Validity of employment relationship and contractual claims under German labor law

The Federal Labor Court (BAG) dismissed the plaintiff's revision, upholding the decision of the Higher Labor Court of Hesse and ordering the plaintiff to bear the costs of the revision proceedings. The dispute centered on a labor law claim regarding the validity of an employment relationship or related contractual terms, where the plaintiff had challenged a lower-court ruling unfavorable to his position. The final decision leaves the original judgments in force, denying the plaintiff relief. The decisive legal basis involved the application of German labor law doctrines concerning the contractual relationship between employer and employee, specifically addressing the procedural admissibility and substantive merits of the plaintiff's claims under the Civil Code and Labor Court Act, resulting in a complete rejection of the appellant's arguments.