A new approach of building enterprise distributed applications for layer of business rules as standard part of architecture is proposed in this paper. The approach uses symbolic transformation system based on rewriting techniques and embedded in Java language and provides analysis and engineering distributed applications at source code level. The benefit of the system is extreme flexibility of the approach and light-weightedness of formal methods and their separate application to program features that does not need to know full semantic model of application programs. The system is implemented and its usage is illustrated with an application example of engineering CORBA middleware application.