This document presents a method for service-oriented business modeling that combines the REA and Open-edi frameworks. It formalizes the resulting OeBTO model using SBVR to facilitate model-driven development. The method involves specifying the value chain, business processes, and business events to develop a computation-independent model expressed in SBVR. This enables automated transformation to platform-independent and specific models. Future work includes defining transformation rules and implementing a tool to generate PIMs and PSMs from the SBVR-based CIM.