A clear understanding of the organizational structure and master data within SAP EWM is essential for executing any warehouse process successfully. This architecture provides the logical and physical framework for all goods movements and inventory management activities. This section details the hierarchical elements that define the warehouse layout and the critical data that defines the products and locations within it.

Hierarchical Structure of Organizational Units

The physical structure of a warehouse is represented in SAP EWM through a clear hierarchy of organizational units. Each level provides a more granular definition of space and function.

1. Warehouse Number This is the highest-level organizational unit and represents the entire physical warehouse complex. It is a four-character field that serves as the primary identifier for a specific warehouse facility.
2. Storage Type A storage type is a physical or logical subdivision of a warehouse, defined by its characteristics and purpose. Examples include racks, open storage areas, a goods receipt zone, or a goods issue area. A storage type can be assigned a specific functional role, such as:
   • Standard Storage: A physical area where products are stored.
   • Identification Point: An area for identifying, labeling, or cross-checking goods during receipt.
   • Pick Point: A location where goods are packed during the picking process.
   • Work Center: An area where value-added activities like deconsolidation or quality inspection occur.
3. These roles are not just labels; they are functionally significant. A storage type designated as a ‘Work Center’, for example, is the physical location where the system will direct goods for processes like deconsolidation or Value-Added Services, which are controlled by process-oriented storage control. Additionally, roles such as Yard, Doors, and Staging Area are used to model the complete physical flow of goods through the facility.
4. Storage Section This is a logical subdivision of a Storage Type. It is used to group storage bins with similar characteristics, such as creating distinct sections for “fast-moving” or “slow-moving” items, a foundational step for optimizing picking travel times.
5. Storage Bin The storage bin represents the smallest physical location where a product is stored in the warehouse. It is the lowest level of the organization structure and provides the exact coordinates for inventory placement and removal.
6. Activity Area An activity area is a logical grouping of storage bins based on the warehouse activity performed there, such as picking, putaway, or physical inventory. A single storage bin can be assigned to multiple activity areas depending on the processes it supports.
7. Quant A Quant is the system record representing the stock of a specific product with identical characteristics (e.g., batch number, stock type) within a single storage bin. It is the lowest level of inventory management in EWM, tracking the quantity of a material at its precise location.

Master Data Integration and Maintenance

Master data provides the essential details about products, customers, and vendors. In an integrated landscape, data such as material descriptions, units of measure, and weight/volume details are created and maintained in the core ERP system. This information is then transferred to the EWM system via an integration model (CIF) to ensure alignment.

Creating the Warehouse Product View

While core data is transferred from ERP, warehouse-specific data must be maintained directly in EWM by creating a warehouse-specific view of the product master. This is done through the Warehouse Product Master (WPM). For example, a “pilferable” flag, which might trigger special handling procedures, can be set in the ERP material master and then further refined in the EWM product master view.

The process for creating a Warehouse Product Master record for an existing product involves these steps:

1. Navigate to the “Maintain warehouse product” transaction in EWM.
2. Enter the Product Number, Warehouse Number, and the Party Entitled to Dispose.
3. Click the “Create” button to extend the product master for the specific warehouse.
4. In the warehouse data view, enter key control indicators, such as the Putaway Control Indicator and the Stock Removal Indicator, which govern how the product is handled.
5. Save the changes to finalize the warehouse-specific product record.

With the static architecture of the warehouse defined by these organizational units and master data, the next step is to understand the dynamic control elements—Warehouse Process Types and Work Centers—that dictate how goods move within this structure.