Industry 4.0 technologies can improve not only the performance of manufacturing and assembly processes, but also the efficiency of related logistic operations can be increased. Within the frame of this article a system is shown for identifying product mixing problems using RFID technologies. Firstly, the laboratory is introduced, where the technology is used. The identification of loading unit building equipment and products is based on RFID tags. We used Excel format database file to hold the binding matrix of the products. We have developed a software that controls our industrial IF30 RFID reader. Our software performs a product mix detection test as well. The paper highlights also the future research directions.