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Tenants lease business applications in form of SaaS (Software as a Service) and their administrators are involved in only adding and modifying the data-processing code in order to operate their specific logics by using a web-based development framework. Especially, customizing of business logics of SaaS applications makes a tenant administrator easy and rapid development by focusing on the data-processing code without concerning about the designing application, administrating database system, and making other additional implementation code. Therefore, the issues of customizing business logics are interesting and challengeable in the SaaS domain. In this paper, we propose the web-based development framework to generate custom business logics of SaaS applications and the runtime engine to process the changes based on the multi-tenant execution environment. The generating and executing custom business logics is core feature and scheduled to be integrated with the SaaS platform, SaaSpia™, which has been developed in ETRI from 2009.