MiLoG § 1 Abs. 1-2, § 2 Abs. 1, §§ 20, 21 Abs. 1 Nr. 9; BGB §§ 242, 362 Abs. 1, § 366; BetrVG § 29 Abs. 2, § 33 Abs. 2, § 77 Abs. 3 S. 1, § 87 Abs. 1; ZPO § 256 Abs. 1, § 286