What Is the Difference Between a WMS and an ERP System?

When a business starts to grow, sooner or later the question arises as to which system should be implemented in order to manage the operation more effectively. Two of the most commonly mentioned are ERP and WMS. The difficulty lies in the fact that, although both are used within the same business context, they serve very different purposes, and it is common for them to be confused, or for it to be unclear which one is more suitable.

This article explains what each of these is, how they differ, and how to decide which one your business requires, or whether both are, in fact, needed.

What is an ERP system?

An ERP (Enterprise Resource Planning system) is software that centralises the information and processes of every department within a company into a single shared database.

Its principal objective is to enable all areas of the business to communicate with one another without the need for separate systems or duplicate records. An ERP functions as the central system that connects finance, sales, human resources, production, and logistics within a single platform.

The most common functions of an ERP include the following:

• Financial management: accounting, invoicing, cash flow, and tax reports.
• Sales and commercial management: orders, quotations, and customer relationships.
• Human resources management: payroll, attendance, and staff performance.
• Warehouse and supply chain management: general control of inventory and suppliers.
• Project management: planning, resource allocation, and tracking.
• Quality management: product standards and lifecycle.

The key term here is generalist: an ERP covers many areas, but does so broadly. They are generally not designed to address the specific and complex operations of a warehouse in depth.

What is a WMS system?

A WMS (Warehouse Management System) is software that specialises exclusively in the operations of a warehouse or logistics centre: from the moment goods arrive until the package is dispatched to the customer.

Unlike an ERP, a WMS does not manage finance or human resources. Its value lies in its depth of specialisation within the supply chain, a level of detail that very few, if any, ERP systems are able to match.

According to AMVO, a WMS is the software that plans, executes, and provides traceability for every movement within a warehouse, and it is precisely this visibility that distinguishes an operation capable of absorbing demand from one that collapses under it.

The main functions of a WMS include the following:

• Receiving and strategic storage: optimal placement of each product within the warehouse.
• Real-time inventory management: levels updated instantly, with no discrepancies.
• Order processing: coordinated and verified picking and packing.
• Real-time shipment tracking: status of each order from dispatch through to delivery.
• Monitoring of staff productivity: metrics by operator, shift, and process.
• Detailed reports: actionable data on warehouse performance.

What is the difference between a WMS and an ERP?

The most significant difference is not one of size, but of focus:

Tip: An ERP and a WMS are not necessarily substitutes for one another, although certain functions may overlap. In general, each one focuses on a different layer of management: the ERP provides an overall view of the business, while the WMS specialises in the detailed operation and management of the warehouse. When integrated, they can complement each other's capabilities and provide more comprehensive management of the operation.

How are ERP, WMS, and ecommerce related?

Within an ecommerce operation, these systems can work in a complementary manner. The online store or marketplace receives the order, the WMS is responsible for executing the necessary tasks within the warehouse, and the ERP centralises information relating to the operation and the business.

A typical flow may look as follows:

Online store or marketplace → Order → WMS → Picking → Packing → Shipping → Order update

The ecommerce platform or marketplace generates the order, and the order information reaches the WMS, where the preparation of the product is managed: inventory location, picking, packing, and dispatch. Once dispatched, the information can be updated on the store so that the customer is aware of the status of their order.

The ERP may play a role throughout this flow, centralising information such as sales, purchases, inventory, invoicing, and finance. Depending on the solution, certain of these functions may coincide with those of a WMS, although the focus differs: the ERP manages the overall view of the business, whereas the WMS specialises in the execution and control of operations within the warehouse.

This distinction is important, as a system that merely records or looks up inventory does not necessarily function as a WMS. A WMS is designed to manage the processes that occur physically within the warehouse and to optimise how products are received, stored, prepared, and dispatched.

Advantages of each system

Advantages of an ERP

• A complete view of the business from a single platform, without switching between systems.
• Communication between departments without duplicating information or introducing data-entry errors.
• Comprehensive analysis that enables decisions to be made with context from the entire operation, rather than a single area.
• Elimination of duplication in records and processes that consume time and give rise to inconsistencies.

Advantages of a WMS

• A higher volume of orders without an increase in errors, owing to the automation of warehouse processes.
• Inventory accuracy of close to 99%, compared with the 80-90% typically recorded in manual operations, according to data from AMVO.
• A reduction in picking errors, one of the most common causes of returns in ecommerce.
• Real-time tracking of inventory, orders, and staff productivity.
• Full traceability of every movement within the warehouse, which facilitates auditing and continuous improvement.

Which is better for your business?

The answer depends on the needs and level of complexity of your operation. Rather than establishing a specific number of orders, it is important to consider factors such as the number of SKUs, the number of warehouses and locations, sales channels, order volume, and the complexity of the picking and packing processes.

An ERP is suitable where:

• You need to centralise information from different areas, such as finance, sales, purchasing, and human resources.
• Your warehouse operation still involves low or medium complexity.
• You are seeking an overall view of the business and wish to connect different processes within the same system.

A WMS is suitable where:

• Warehouse management requires greater control and precision.
• You handle a large catalogue of SKUs or multiple storage locations.
• You sell through different channels and need to centralise order preparation.
• Your picking and packing processes are becoming increasingly complex or frequently give rise to errors.
• You require real-time visibility into the status of your inventory, orders, and operations.

Both together, where:

• You need to combine overall business management with a greater level of control over warehouse operations.
• Your company has multiple channels, warehouses, or processes that require more detailed coordination.

Conclusion

For brands that have their own warehouse, WMS Envia.com allows you to manage and organise warehousing and order preparation operations from a single platform. You can connect your ecommerce store, manage inventory, and track your orders, in addition to having access to tools such as user management and warehouse operations, in order to gain greater control over each order.

If you do not have your own warehouse, or would prefer to outsource this part of your operation, Fulfillment Envia.com allows you to outsource processes such as storage, preparation, and shipping of orders, so that you can keep your logistics operation centralised while focusing on the growth of your business.