Unless your ERP system comes with an APS system this one is dead wrong. Solving scheduling problems with standard ERP/MRP logic is equivalent to trying to solve a three-dimensional problem with two-dimensional logic. In other words, it simply can’t be done in a timely manner.
Replacing complex ERP logic with Kanban and demand-based manual systems is very tempting, but of course, it has its limitations. Toyota themselves recognized the limitations of these techniques in a demand-driven business model. This is because manual systems do not give you the ability to plan around your capacity constraints. This becomes critical once the buffers of time and inventory have been removed from the equation. In most cases, an APS system will support and improve your lean initiative.
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