The text of the decision provided contains only the procedural disposition (reversal of the appeal court, dismissal of the plaintiff's appeal, and cost allocation) without the factual or legal reasoning (the "Erwägungen"). Therefore, the specific subject matter of the employment dispute and the decisive legal issue cannot be identified from the available text.

The Federal Labor Court (4th Senate) reversed the appeal court's decision and dismissed the plaintiff's appeal, thereby upholding the lower court's judgment in favor of the defendant and ordering the plaintiff to bear the costs of the appeal and revision proceedings. The dispute concerned an employment law matter where the plaintiff sought to overturn the initial dismissal of their claim, likely related to a specific entitlement or contractual obligation. While the detailed material facts are not present in the provided text, the procedural posture indicates a standard civil employment litigation where the plaintiff's arguments failed to satisfy the court. The decisive legal basis rests on the substantive labor law principles applied by the Federal Labor Court, which found no merit in the plaintiff's challenge against the defendant's position.