In larger systems with multiple robots sharing a common task, the key success factor is the product flow. Especially for error conditions, the complexity thereby surpasses imagination. Typically, the logistics concepts have to be prooven on the final system - under time pressure and at a stage, error are expensive. VELTRU can simulate ans visualize the system using the real system software. This powerful feature enables customers to verify system concepts at an early stage of the project. VELTRU has perpared such a simulation for a customer, who has been using it also for sales support activities.