This paper presents an approach for the automated testing of Enterprise Resource Planning (ERP) systems. ERPs are complex software systems that provide a chain management covering all corporate activities. Testing of these systems is a complex task given the close interrelation between the functionalities of system modules. Test automation is also an important issue, in order to reduce testing time and cost. To this end, our approach for the automation of ERP systems testing, is based on the system modeling as a set of business processes to meet the needs of the business and reduce, for this purpose, the risks of errors. The methodology used in this context is to combine the system modeling and the tools to manage automation of ERP-tests. Following this approach, from the basic requirements, a number of test purposes are defined and test cases are generated using a test generation tool, which are then run on the ERP system. In order to illustrate the application of the proposed method , test experiments have been performed on a real case study, the ERP ODOO