Both, ERP and MDM target integration: ERP follows a business process centric approach and integrates master data along value chains into one ERP system. MDM follows a broader approach and targets providing an enterprise-wide single version of the truth of selected master data objects and distribution of them to the different target IT systems. ERP and MDM include overlapping master data management functionality and the question appears how they can complement each other specifically in the case of complex ERP landscapes. This paper describes the results of a multiple-case study analysis and interpretation of MDM approaches in the context of ERP landscapes. We identify and discuss major business use cases, a conceptual architecture and requirements for an ERP-centric MDM approach in this paper.