For some time, we have focused our research on the generic B2B middleware services for managing interenterprise communities of autonomous business services. In contrast to some earlier papers where the relationships between the Pilarcos concepts and their counterparts from the ODP-RM are shown, this paper approaches the management system for inter-enterprise communities itself as the ODP system of interest. The lessons learned underline a number of research challenges we are currently working with, especially for the B2B middleware repositories, their federations, and service development tools relying on the federated repositories.