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This session is based on a customer case at a Telecom company in Sweden. The company is in the process to implement a new solution for accounts receivable based on SAP in order to replace two systems. Throughout the transition time, this company ran three systems in parallel. During the implementation, an easier user interface was needed to improve the user experience for the end user and to make the transition onto the new platform easier. The company's solution was to build a new user interface on top of the three systems based on Web Dynpro and SAP NetWeaver Exchange Infrastructure (SAP NetWeaver XI).This session shows you how to solve customer issues with help of the enterprise services architecture. SAP NetWeaver XI contains an enterprise service that fetched the data from the three different systems and published it in Web Dynpro.