Entitlement to wage claims and retroactive interest accrual under German labor law

The Federal Labor Court (BAG) upheld the plaintiff's claim by reversing the appellate court's judgment and dismissing the defendant's appeal, ordering the defendant to pay the disputed wage claim plus interest starting from December 4, 2012, and to bear the legal costs of the second and third instances. The case involved a dispute over the employee's entitlement to specific compensation, where the defendant challenged the lower court's calculation or award of wages. The decision rests on the interpretation of statutory wage entitlements and interest accrual rules under German labor law, confirming that the plaintiff was entitled to the claimed amount with interest retroactive to the specified date.