WMS

What it means

A WMS, warehouse management system, is an information system for running a warehouse. Unlike simple stock records, which track only quantities and values, a WMS knows exactly where each item sits, on which rack, shelf and in what quantity, and controls the movement of goods throughout the warehouse.

The system covers all the main warehouse processes: receiving and checking goods, put-away to the best location, order picking, packing, dispatch and stocktakes. It works with barcode scanners, mobile terminals or RFID, so staff confirm every step and the system updates stock levels immediately.

A WMS is usually linked to an ERP or accounting system, the online store and carriers. The ERP handles the commercial and accounting side of inventory, the WMS the physical movement in the warehouse. Smaller companies sometimes use an ERP warehouse module; larger warehouses and logistics firms use a standalone WMS with advanced features.

How it works in practice

The benefit of a WMS is greatest with many items and orders. The system proposes the best picking route, batches orders, decides where to take goods from by expiry date or FIFO, and flags errors such as scanning the wrong product. This shortens picking times and reduces complaints about wrong shipments.

With fulfilment and outsourcing logistics to a third-party logistics partner, the provider's WMS is key. The company should have access to it, or at least an integration, to see stock and order status in real time. When choosing a partner, it is worth checking the quality of its system and integration options.

A WMS simplifies stocktaking. Instead of a one-off count of the whole warehouse that halts operations, it allows continuous counts of individual locations. Results are compared with system stock and differences resolved at once. The accounting stocktake at the balance sheet date must, however, still be documented as the law requires.

What to watch out for

The most common mistake is introducing a WMS without adjusting processes and training people. If staff bypass the system, for example moving goods without scanning, the data stop matching reality and the system loses its point. Discipline with every movement is a condition of success.

Watch the link to the accounts. Stock in the WMS and in the books must be reconciled regularly. Differences arise from data transfer errors, goods in transit or incorrect valuation. Unreconciled differences show up at stocktake and can distort the value of inventory in the financial statements.