Incorrect Cost Estimate with BOM
According BOM of some assembly part, material just consume only component part 1ea. However after executing cost estimate (CK11N transaction). The result got that component 2ea.
The error might be caused by some value in material master. If assembly material master is updated the component scrap in percent field on MRP4 view. This makes the cost estimate increased.
Component scrap in percent value is also used in material requirement planning (MRP) to determine the quantities of component required. When exploding the bill of material (BOM), the SAP system will increase the required quantities of the components by calculated scrap quantity
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Special View on a BOM – BOMs Usage
If separate BOMs are maintained for a product in different areas of your company, BOM reporting functions can be used to obtain information that is directly relevant to your requirements.
- design BOM
- production BOM
- costing BOM
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SAP PP : BOM Usage
Many companies have only one universally applicable BOM structure for all areas of their company. This structure usually takes the form of complete single-level BOMs, created in the design department, and used in both material management and the assembly workshop.
The standard SAP system allows you to maintain individual BOMs for any area of your company. These BOMs are maintained independently of each other and are assigned different internal BOM numbers.
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Effectivity types of BOM
The change master record determines which effectivity conditions apply when a BOM is changed. You can either create a change master record with date effectivity (Valid-from date) or with parameter effectivity.
If you want to use company-specific criteria (instead of dates) to determine when changes are effective, parameters to define effectivity can be used then.
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Extending the Area of Validity of BOM
The area of validity (plant or group) that was defined when a BOM was created, can be extended. To do this, you allocate the same bill of material to a material in different plants.
- You can allocate a BOM created in a specific plant (such as 0001) to additional plants (such as 0002 and 0003) or to the entire group (blank).
- You can allocate a group BOM to individual plants.
These related BOMs are identified by a common internal BOM number in the standard SAP system. This internal BOM number is displayed on all screens for plant allocations.
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BOMs Effectivity
In the standard SAP system, validity areas and periods are used to define the precise conditions under which a bill of material is valid in different areas of a company.
Material BOMs can be valid on different organizational levels:
A material BOM can be used to manage data that applies directly to production. This is why the area of validity is the plant. The plant is the location where all necessary work-scheduling procedures are organized, such as MRP and creating routings.
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