Service-oriented architecture (SOA) is recognized as an enabler to overcome limitations of traditional monolithic application architectures such as efficiently adapting to changing business requirements and external partners with individual systems. However, services within any SOA require broadly accepted service definitions and a systematic management after the design stage. Thus, ownership of these services among the business partners as well as within the enterprise is essential for the implementation, operation and management of SOA and ultimately its business value. This paper enhances existing approaches which mainly comprise roles and management activities on a generic level. It proposes a procedure for identification and allocation of service ownerships from a business perspective which has been applied in the banking industry.