If you do not know your supply constraints, then it is likely your constraint is the MRP system.
How to use constraints-based planning and overcome the limitations of MRP logic.
Today, manufacturing excellence is built on execution. Lean manufacturing places emphasis on daily execution to customer demand. It favours a system of visual signals on the factory floor to replace computer planning and paper reports. Does this mean that production scheduling is in conflict with best practices of lean and demand-driven production? Certainly not. Scheduling goes far beyond Master Production Scheduling, is an essential part of integrated planning and a powerful way to model real-world constraints in a supply chain.