A merchandise management system (German: Warenwirtschaftssystem, 'WaWi') is software for controlling the flow of goods in a retail business – from purchasing and warehousing through order processing to shipping. It centrally manages products, stock levels, suppliers, customers and documents such as orders, delivery notes and invoices.
The merchandise management system is the memory of your retail business: it knows which products exist, how many are in the warehouse, what has been ordered and what still needs to be shipped. The online shop is the display window – the WaWi is the office and warehouse system behind it.
Why do I need a merchandise management system?
As long as only a few orders arrive per week, stock and documents can still be managed in the shop backend or in spreadsheets. As the product range and order volume grow, this approach reaches its limits: there is no central stock management, no continuous document flow from order through delivery note to invoice, and no purchasing support – such as automatic reorder proposals when stock falls below minimum levels.
For clarity: an ERP system additionally covers areas such as financial accounting, HR or production, while a merchandise management system focuses on the flow of goods. The boundaries are fluid, and many systems can be extended modularly. JTL-Wawi, for example, is widely used in German-speaking online retail; larger mid-sized companies tend to use full ERP systems.
Practical relevance for shop owners
Merchandise management becomes really important in multichannel sales: if you sell not only through your own shop but also via marketplaces such as Amazon or eBay, you need central stock management – otherwise two channels sell the same last item. The WaWi distributes stock across all channels, consolidates incoming orders and controls shipping. The connection to the shop is handled by an ERP integration; rich product information such as texts and images is often additionally maintained in a PIM system. Our article on PIM strategy describes what matters when it comes to product data ownership.
Typical mistakes in selection and rollout
In our experience, these oversights recur when introducing a merchandise management system:
- Tool before process: The software is chosen before purchasing, warehouse and shipping workflows have been properly described.
- No leading system for product data: If products are created sometimes in the shop, sometimes in the WaWi, duplicates and inconsistencies follow.
- Missing stock buffer: On marketplaces without a safety stock, every synchronisation delay quickly leads to overselling.
- Legacy data migrated unchecked: Migrating flawed product and customer data without cleansing carries the problems into the new system.
- Integration ecosystem ignored: What matters is whether the system can connect shop, marketplaces, shipping and accounting – not the feature list alone.
What to look out for
Before selecting a system, draw up a list of requirements: which sales channels, how many products and warehouses, which document types, which connections to accounting and shipping? Then specifically check how well the interfaces to your shop system are maintained and whether the system scales with your growth. Plan the migration realistically, with a test phase and a clear cut-over date – a rushed switch during day-to-day business usually backfires. Our consulting services support you with system selection and connecting it to your e-commerce platform.
We connect merchandise management systems such as JTL-Wawi to Shopware, WooCommerce and other shop systems – including stock, order and product synchronisation. Find out more on our integrations page.