In the business Grid environment, the business relationship between a customer and a service provider should be clearly defined. The responsibility of each partner can be stated in the so-called Service Level Agreement (SLA). In the context of SLA-based workflows, the business model is an important factor to determine its job-resource-mapping policy. However, this aspect has not been described fully in the literature. This paper presents the business model of a system handling SLA-based workflow within the business Grid computing environment. From this business model, the mapping policy of the broker is derived. The experiment results show the impact of business models on the efficiency of mapping policies.