What is replenishment in FC operations and what typically triggers it?

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Replenishment is the process of moving inventory from bulk or reserve storage into the picking locations so items are ready for order fulfillment. In fulfillment center operations, the trigger is typically when stock at the picking location drops to a predefined minimum or when the WMS sends a demand-driven signal that more of that item is needed. This approach keeps picking faces stocked, reduces the risk of stockouts, and supports smooth throughput. Supplier holidays affect inbound receipts rather than the day-to-day replenishment trigger. Monthly billing cycles are unrelated to replenishment actions, and seasonal spikes may influence planning but do not by themselves drive replenishment—the action is driven by current stock levels and system signals.