Direct answer. An ERP (Enterprise Resource Planning system) is software that centralizes and connects a company's main functions — finance, purchasing, sales, production, stock, human resources — in a single database, so that every department shares the same up-to-date information.
A cross-functional management backbone, not a shop-floor tool
The founding idea behind an ERP is to avoid re-entering data and inconsistencies between departments: an order recorded on the sales side updates available stock, triggers a purchasing need if necessary, and feeds accounting, with no manual re-entry between modules. The best-known vendors on the market range from large international players (SAP, Oracle, Microsoft Dynamics) to solutions more accessible to French SMEs and mid-sized companies (Sage, Cegid, Odoo, Divalto).
In a logistics organization, the ERP generally manages the overall level: customer and supplier orders, invoicing, accounting, production planning. It often includes a stock-management module, but this generally remains insufficient to finely control the physical operations of a large warehouse — precise locations, optimized picking routes, wave-picking management. That is why a company with significant logistics volume complements its ERP with a WMS dedicated to warehouse execution, the two systems being interfaced to exchange orders, stock movements and inventory levels.
The choice of separating ERP and WMS (rather than relying solely on the ERP's stock module) depends essentially on the volume and complexity of physical flows: a small, low-turnover warehouse can be satisfied with the ERP module alone, whereas a high-throughput site with complex picking or automation generally benefits from separating the two software layers.
FAQ
What is the difference between an ERP and a WMS?
The ERP centralizes overall company management (finance, purchasing, sales, HR) with a stock module that is often limited. The WMS specializes in the physical execution of the warehouse (locations, picking, fine-grained traceability). The two are generally interfaced rather than substitutable for one another.
Do you always need a separate ERP and WMS?
No: a low-volume or slow-turnover site can make do with its ERP's stock module. A dedicated WMS becomes worthwhile once flows grow more complex (high throughput, multi-step picking, automation), since it offers much finer control over physical operations.
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