Employment law dispute concerning the defendant’s revision appeal against a Landesarbeitsgericht judgment.

The Federal Labour Court (BAG) dismissed the defendant's revision, thereby upholding the Landesarbeitsgericht Köln’s judgment of February 12, 2009, and ordering the defendant to bear the costs of the revision proceedings. The dispute concerned an employment law matter, where the defendant challenged the lower court’s decision following a loss in the intermediate appellate instance. While the specific subject matter and underlying facts are not detailed in the provided text, the decisive legal basis involved the court's application of labor law principles sufficient to affirm the validity of the Landesarbeitsgericht’s ruling against the employer’s appeal, resulting in the final maintenance of the lower court’s operative orders.