Optional Replenishment System
An optional replenishment system is a hybrid inventory policy combining periodic review and continuous-review logic. Inventory is checked at fixed intervals, and an order is placed only if stock position falls below a predetermined threshold at review time. This avoids uneconomically small orders while protecting against stockouts. The replenishment quantity is typically the gap between maximum inventory target and current stock, making order sizes variable.
In practice, optional replenishment often runs through a weekly material planning cycle. A planner or WMS reviews line-side bins and reserve locations at a fixed cadence. If inventory sits above the reorder point, nothing happens. Once stock drops below that threshold, the system calculates a variable order quantity by subtracting current inventory position from a preset maximum target. Material then moves from bulk storage to the supermarket, or a purchase order is triggered. This approach suits fast-moving consumables where frequent orders create transaction overload, but demand is stable enough that a weekly review protects production. In SAP EWM and JD Edwards, the method is configured as a system behavior using reorder point logic at the review moment rather than after every pick. Accuracy of master data is critical, because the decision rests on one snapshot at review time.
- Stockout during the review interval: Demand can consume stock before the next periodic review, especially with long lead times or unexpected spikes. The reorder point must cover expected demand during both the review cycle and replenishment lead time.
- Tiny but frequent orders: If the threshold sits too close to normal consumption, the system repeatedly triggers small replenishments. That defeats the model's purpose and drives up handling and ordering cost.
- Bad master data or location mismatch: If the system reads the wrong bin, item, or stale on-hand quantity, replenishment can trigger for the wrong location or skip entirely. This causes line-side shortages, excess reserve inventory, and blocked picking operations.
Is optional replenishment the same as reorder point replenishment?
Not exactly. Optional replenishment is a hybrid periodic-review policy that uses a reorder threshold at review time, while reorder point logic can also be implemented as a more direct continuous-trigger approach depending on the system.
What inventory signal does it rely on?
It relies on the inventory position at the review point, meaning available stock plus any on-order quantity, compared against a threshold or reorder level.
Why is it called “optional”?
Because an order is optional at each review point—the system only orders if inventory has fallen below the threshold by that moment.