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Service Oriented Architecture (SOA) based application can be composed of heterogeneous self- contained independent services on the web. These applications are usually modified to fix bugs or to enhance their functionality. These modifications are quick and they should be supported by rapid verification. Regression Test (RT) is essential to ensure that modifications do not result in adverse effects. Regression Test Selection (RTS), one of the cheapest techniques, aims at decreasing cost of carrying out RT. This paper presents a Control Flow Graph (CFG) based approach that makes it feasible to apply a safe RTS technique to SOA based applications or services in an end-to-end manner. Safe RTS technique guarantees that no modification revealing tests will be left unselected. A simplified navigational subsystem that involves 3 services, is used to elicit our approach.