A tool was developed, which can be used for partial automatic upgrade of reports in the upgrade process of Microsoft Dynamics NAV. The upgrading of reports from classic to RDLC system of reporting is a complex and time consuming process. The basics of development in Microsoft Dynamics NAV are described as is the classic reporting and RDLC reporting, that was introduced with the adoption of three-tiered architecture. The changes in report creation and visualization of reports in both reporting systems are described. The spacial complexity of flat dataset is also analysed. Described is also the report upgrading process with existing tools. Our focus is primarily on how visualization must be upgraded. The tool that we have developed seeks to eliminate the most time consuming aspects of report upgrading and offers a faster and easier way of upgrade for Microsoft Dynamics NAV. The results of solution, developed in the content of this work, are compared with results from existing solutions.