The ERP system which has been adopted as a tool for integration of information systems and for innovation of business process. And it is regarded to be able to maximize the productivity of business process and achieve process innovation based on the best practice incorporated in the ERP. To achieve process innovation through ERP, strong sponsorship from top management and building consensus through the entire organization is required to be backed UP. There are many cases of the failure of Process Innovation due to reluctance of corporate members to change. In the result of the case study, it seems to be difficult to build the consensus of the related groups to ERP project. There are still argues after project, on whether the project was success or not. Through the AHP analysis for the success factors, it is explored that the reason is that several groups of the company had different expectation for the project. And to achieve the aimed process Innovation, the project members in the related departments should build the consensus of expectation on the project.