ERP demos are designed to show the product at its best. Problems start when a multi-year decision is based on a presentation lasting only a few hours.
Before meeting vendors, document critical processes, exceptions, integrations, regulatory requirements, transaction volume and success criteria. Turn them into one evaluation matrix used by every participant.
The best selection is not the system with the most features. It is the best fit across processes, adoption capability, architecture, total cost, implementation risk and business strategy.