  Software as a Service (SaaS) becomes in this decade the focus of many
enterprises and research. SaaS provides software application as Web based
delivery to server many customers. This sharing of infrastructure and
application provided by Saas has a great benefit to customers, since it reduces
costs, minimizes risks, improves their competitive positioning, as well as
seeks out innovative. SaaS application is generally developed with standardized
software functionalities to serve as many customers as possible. However many
customers ask to change the standardized provided functions according to their
specific business needs, and this can be achieve through the configuration and
customization provided by the SaaS vendor. Allowing many customers to change
software configurations without impacting others customers and with preserving
security and efficiency of the provided services, becomes a big challenge to
SaaS vendors, who are oblige to design new strategies and architectures.
Multi-tenancy (MT) architectures allow multiple customers to be consolidated
into the same operational system without changing anything in the vendor source
code. In this paper, we will present how the configuration can be done on an
ERP web application in a Multi-Tenancy SaaS environment.
