PMP Question of the Day

You are leading a construction project with a hybrid approach where design work follows agile iterations while procurement and construction follow predictive methods due to regulatory requirements. Your team has just completed an iteration that resulted in significant design changes based on user feedback. However, these changes conflict with materials already procured based on earlier design decisions. The procurement lead insists on using the existing materials to avoid waste and delays, while the design team believes the new approach better serves the end users. How should you proceed?