What Is Warehouse Management System (WMS)?
Also known as: WMS, warehouse management software
Definition
A warehouse management system (WMS) is software that directs and records warehouse work at bin level: receiving, put-away, replenishment, picking, packing and shipping. It tells operators where to go and what to scan, and posts the resulting stock movements to the ERP.
Warehouse Management System (WMS) Explained
An ERP knows how much of an item exists and in which warehouse. A WMS knows exactly which bin, pallet or license plate holds it, and orders the physical work to move it. The ERP owns demand, orders and valuation; the WMS owns task execution, location logic and labour on the floor.
Typical WMS functions include directed put-away rules, pick path optimization, wave and batch release, cycle counting, lot and serial capture, and carton or pallet building. Handheld scanners confirm each step so the book quantity stays in step with the shelf quantity.
In Infor LN the Warehousing module covers warehouse orders, inbound and outbound procedures, and handling units. SyteLine has location-level inventory and the optional Mobile and Warehouse Mobility tooling. NetSuite offers a Warehouse Management System bin and wave-pick feature set. Larger operations often add a dedicated WMS and integrate it by API or EDI.
Not every plant needs one. If you have a few hundred locations, low line counts per day and a disciplined stockroom, the ERP's own bin tracking and scan transactions may be enough. A WMS pays back when pick errors, search time or multi-site complexity become the bottleneck.
Why It Matters
- Bin-level accuracy cuts mis-picks, stock-outs that are not real, and expensive expedited freight.
- Directed work lowers dependence on tribal knowledge, which matters when staff turn over.
- Scan-confirmed movements produce the lot and serial history that traceability audits ask for.
- A clean ERP-to-WMS interface keeps inventory valuation and shipping documents consistent.
In Practice
A plant ships 400 order lines a day from 2,500 bins. Pickers walk order by order and about 1 line in 100 is wrong. Moving to scan-confirmed batch picks sorted by aisle sequence typically reduces walking and shrinks the error rate to a fraction of that, but only if put-away discipline is fixed first, because a pick list cannot beat a wrong bin.
Frequently Asked Questions
What is the difference between a WMS and ERP inventory?
ERP inventory tracks quantity, cost and demand by item and warehouse. A WMS adds bin-level location, task direction, scanning and labour control for the physical work.
Does a manufacturer need a separate WMS?
Often not at small scale. Modern ERPs have bin tracking and mobile scanning. A separate WMS makes sense for high line volumes, multiple sites or complex pick logic.
How does a WMS connect to the ERP?
Usually through APIs, web services or EDI-style messages. The ERP sends orders and receipts to the WMS, and the WMS returns confirmed picks, receipts and adjustments.
Related Terms
Warehouse Order
A warehouse order is the execution document in Infor LN Warehousing that carries out an inbound, outbound or transfer movement. It is generated from an originating order such as a sales, purchase, production or transfer order, and its order type defines the procedure steps.
Cycle Counting
Cycle counting is the practice of continuously verifying inventory accuracy by counting a small subset of items each day or week, rather than shutting down for one annual wall-to-wall physical inventory.
Perpetual Inventory System
A perpetual inventory system updates on-hand quantity and inventory value in real time with every receipt, issue, transfer and adjustment, so book balances are always current. A periodic system updates only after a physical count.
Traceability
Traceability is the ability to follow the history, location, and application of a part or material through the supply chain and production process, both backward to its sources and forward to every product and customer it reached.
Handling Unit
A handling unit in Infor LN is an identified physical package - a pallet, carton or container - tracked with its own ID. Handling units nest hierarchically, carry item, lot and serial data, and move through warehousing and shipping as a single scannable entity.
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