The existence of duplicate land title certificates gives rise to legal issues concerning the legal status of a Land Sale and Purchase Deed (AJB) executed before a Land Deed Official (PPAT). This issue frequently becomes the subject of litigation, in which the AJB serves as the legal basis for claims arising from disputes over duplicate land title certificates. One of the principal functions of an AJB executed by a PPAT is to serve as documentary evidence in the event of a legal dispute. However, when a court judgment declares an AJB invalid and devoid of legal effect, questions inevitably arise regarding the legal status of the AJB executed under the authority of the PPAT.