Warehouse replenishment is the movement of stock from reserve storage, usually pallets in the racking, to the forward pick locations the pickers walk: the pick face, warehousing's name for them. It exists because the two jobs want different things: reserve storage wants density and long-term accuracy, the pick face wants a small quantity of every fast SKU within arm's reach. Replenishment in warehouse operations is the process that connects them, and when it is late a picker arrives at an empty location, the line is short and the order waits. This page covers what triggers a replenishment, who does it and when, and how it is written up so it happens before the shortage rather than because of it.
The trigger: minimum, maximum and demand
Each forward location carries a minimum and a maximum quantity. When a pick takes the location below its minimum, the system, or the picker's note, raises a replenishment task to bring it back to maximum from reserve. Demand-based replenishment goes a step further and reads the day's released orders before picking starts, so any location that will run short during the wave is topped up first. A small operator with a barcode WMS gets the first automatically and can approximate the second by reading the wave's line totals against forward stock each morning. The minimum is set from velocity, and it is reviewed when the SKU is re-slotted.
The task: who, when and from where
A replenishment is a forklift or a cart moving a pallet or a case quantity from a named reserve location to a named forward location, scanned out of one and into the other so the count stays true in both. It is done by a replenisher, not the picker, and it is done in the window before the pick wave or between waves so forklifts are never in the pick aisles while pickers are. The reserve location is chosen by the system's rule, first-expiring or oldest receipt where the client controls lots, nearest otherwise. A replenishment that is keyed rather than scanned is the most common cause of a forward count that reads full while the shelf is empty.
The SOP that makes it routine
Replenishment is one of the processes a client account adds to the procedure pack, alongside receiving, putaway, picking, packing and returns, and it has a client variant wherever lot rules or packaging differ. The warehouse SOP template worksheet on this site counts the pack and the training hours behind it from the processes and clients you enter, so a new client's replenishment rules are written before its first wave rather than discovered by a short pick. Pickpathly Pro keeps the SOP against the client with its version and review date.
Questions people ask about warehouse replenishment
What is replenishment in a warehouse?
Moving stock from reserve storage to the forward pick locations so pickers always find the quantity the system says is there. It is triggered by a location falling below its minimum or by the demand in the next pick wave.
Who should do warehouse replenishment?
A replenisher on a forklift or a cart, working before or between pick waves, not the picker. Keeping forklifts and pickers out of the same aisles at the same time is both a safety rule and a throughput rule.
How is the forward location minimum set?
From the SKU's velocity: enough to cover the picks between replenishment windows with a margin. It is reviewed whenever the SKU is re-slotted or its order pattern changes.