In the Materials Management (MM) component of the SAP System you can define several different units of measure (stockkeeping units) for each material that are all taken into consideration in WM.
The base unit of measure is the basis for inventory management and evaluation. Alternative units of measure, such as the order unit, issue unit or WM unit of measure, are defined to identify packages or containers for smaller units of measure such as cartons, boxes, bottles, barrels or pallets.
Units of Measure used in WM
Base Unit of Measure
Quantities of warehouse materials (quants) are counted using the base unit of measure (UoM). Quantities in alternative units of measure are always converted to the base unit of measure for calculation purposes.
The stockkeeping unit is synonymous with the base unit of measure. In the SAP System, the term “base unit of measure” is more commonly used.
WM Unit of Measure
The WM unit of measure (WM UoM) is an alternative unit which can be defined in the Warehouse Management view of the material master record.
Unit of Issue
The unit of issue (UoI) is a unit of measure generally used in Inventory Management for processing goods receipts and goods issues.
Other Alternative Units of Measure
Alternative units of measure can also be defined to identify packages or lager containers for smaller units of measure such as cartons, boxes, bottles, barrels, pallets (storage unit types) and so on.
How can you implement the various units meaningfully?
The use of several different units of measure in the SAP system is useful, for example, for accounting, storage and packaging purposes. For example, if a crate contains several thousand pieces of a particular material, it is more expedient to purchase, package and sell this material by the crate or box rather than by the piece. Additionally, it is important to use units of measure that cause no field overflows to occur when the quantities are increased.
Alternative Units of Measure in the Material Master
Additionally, in the WM view of the material master record, you can define a loading quantity for each pallet type or storage unit type (SUT). You can enter this quantity using any unit of measure that has been defined in the system.
A material is normally managed in kilograms. It is stored in the warehouse in sacks and is transported in large wire baskets. In this case, the base unit of measure is "kilograms"; the alternate unit of measure is "sack" (for example, one Sack = 10 kg) and you can define this in the WM view of the material master so that one wire basket contains 5 sacks or 50 kilograms.
The SUT is an important factor for the automatic stock placement strategy. The quantity to be putaway is divided by the quantity that is defined to fit on one SUT and is distributed for storage based on the strategy and capacity of the storage bins in the warehouse.
Converting Alternative Units of Measure
Since the MM system uses the base unit of measure for calculation purposes, the WM application requires that a conversion be defined for any alternative units of measure that have been assigned to a material.
When you create a new material in the system, for example, if you designate "piece" as the base unit of measure and "box" as an alternative unit of measure, the system will display a conversion window which asks you to define how many pieces are contained in a box.
Default Quantity Units
The default unit of measure is the unit of measure that is selected by the system when you enter only a material number and quantity into the system. When you define a warehouse number you can designate primary and secondary default units of measure. These are then used by the system if you do not specify a unit of measure during a transaction. You enter them in the 1st default UoM field and the 2nd default UoM field in the Quantities/Weights section of the warehouse number record screen. If the primary default quantity unit is not maintained for a material, the secondary default quantity unit is used. If the secondary default quantity unit is not maintained for the material, the base unit of measure is used.
Using Units of Measure in Transfer Order Processing
You confirm transfer orders using any unit of measure that is allowed for the material. The system converts this into the alternative unit of measure and stores it when the transfer order item is processed. In the data fields 1st and 2nd default UoM in the warehouse number record, you can change the unit of measure proposed as a default by the system (i.e., if users do not enter a UoM). Units of measure from preliminary documents such as transfer requirements and deliveries are usually taken over by the system. Using the characteristic M, it is also possible to edit these documents automatically based on the WM unit of measure.
Units of Weight
During the planning stage, the transfer of materials, and the subsequent display of warehouse stock, WM supports all related alternative units of measure for processing. For example, if the weight of a particular material is managed in kilograms, the system can make calculations based on the input of weight measures such as grams, ounces, pounds or tons. It is important to use units of weight that cause no field overflows once WM has become active.
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Sap Wm Tutorial
Warehouse Management Guide
Warehouse Structure In The Warehouse Management System
Planning And Monitoring
Basic Stock Management
Hazardous Materials Management
Wm Interface To Quality Management
Stock Transfers And Replenishment
Posting Changes In Wm
Putaway And Picking Strategies
Storage Unit Management
Interfaces To External Systems
Mobile Data Entry
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