In current IT landscapes, there is a trend towards deploying multiple services each incorporating its own identity management system. When implementing role-based access control (RBAC), each system might utilize different roles adjusted to its own domain. We consider inter-domain role mapping as a solution to this problem. In contrast to most of the existing work, we focus on synchronizing multiple access control systems used by a single organization. Therefore, we first introduce a framework as well as requirements for the successful implementation of role mappings from one central, organizational domain to various target domains. Next, we conduct a systematic literature review and show the current state-of-the-art in inter-domain role mapping. Finally, we compare the contents of the analyzed literature with our requirements to find open issues for effectively managing RBAC in hybrid cloud environments.