Short answer
A warehouse management system (WMS) tracks where each item physically sits, where incoming goods should go, which bin to pick from, and whether cycle counts match. ERP or accounting inventory knows how many you have and what they are worth, but usually not the shelf location. You need a WMS with many SKUs, several warehouses or zones, lot or expiry control, or hundreds of picks a day. A single small warehouse is usually fine with ERP inventory and barcodes.
ERP and WMS compared
ERP answers how many and how much. WMS answers where, and what to do next. They work together: the WMS posts receipts and issues back to ERP.
| ERP or accounting inventory | WMS | |
|---|---|---|
| Answers | Quantity, value, cost of sales | Location, where to store, where to pick |
| Tracks by | Warehouse or branch | Bin, lot and expiry date |
| Main users | Accounting, purchasing, sales | Warehouse staff |
Signs you need a warehouse system
If several apply, the problem is not the count but that nobody knows where things are.
- The system says it is in stock but nobody can find it
- Wrong models or sizes are picked and returned
- Every annual count disagrees with the system
- Older lots or near-expiry goods should go first, but do not
Before investing in a warehouse system
- Is the problem wrong counts, or not finding items?
- Does every bin have a location code?
- Does each product have exactly one code?
- Does your current ERP already support storage locations?
Frequently asked questions
Do I need both ERP and a WMS?
Not always. A single small warehouse is often fine with ERP inventory and barcodes. A separate WMS pays off with large or multi-zone warehouses, high pick volumes, or lot and expiry control, and it must post back to ERP automatically.
What is the difference between FIFO and FEFO?
FIFO ships the oldest stock first; FEFO ships what expires first, for food, medicine and cosmetics. Both only work if the system knows which lot is in which bin.