Abstract: An apparatus, system, and method are disclosed for automatically maintaining identity relationships among disparate enterprise information systems. The apparatus comprises a synchronization hub comprising an identity relationship repository, a relationship service module, a consistency module, and an adjustment module. The relationship service is configured to access a target relationship entry using a unique key from a source business object, wherein the source business object is representative of changes made in a source enterprise information system. The various components and modules of the synchronization hub cooperate to determine identity relationships that need updating and to propagate identity relationship changes to one or more destination enterprise information servers.