How To Fix MW428 - Allocation rule & not allowed for generic material

SAP Error Message - Details

• Message type: E = Error

• Message class: MW - Messages IS-R / Allocation Tables

• Message number: 428

• Message text: Allocation rule & not allowed for generic material

What causes this issue?

You are using an allocation rule for which the quota category has been
configured as fixed quantities.

System Response

The system only allows allocation rules with the quota category
"quotas" for generic materials.

How to fix this error?

Maintain the allocation rule with the quota category fixed quantities
in the variant screen or use an allocation rule with the quota category
"quotas".

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MW428 - Allocation rule & not allowed for generic material ?

  The SAP error message MW428 ("Allocation rule & not allowed for generic material") typically occurs when there is an attempt to perform a stock allocation or a similar operation involving a generic material. Generic materials in SAP are materials that do not have a specific material number but are instead represented by a generic identifier. This can lead to restrictions in certain operations, including allocation rules.
  Cause:
  
  Generic Material Usage: The error arises because the allocation rule being applied is not compatible with generic materials. Allocation rules are often defined for specific materials, and generic materials do not have a specific allocation rule associated with them.
  Configuration Issues: The system may not be configured to handle allocations for generic materials properly, or the allocation rules may not be set up to include generic materials.
  Material Master Settings: The settings in the material master for the generic material may not allow for certain operations, including allocation.
  
  Solution:
  
  Check Allocation Rules: Review the allocation rules defined in the system. Ensure that there is an appropriate allocation rule that can accommodate generic materials. If necessary, create or modify an allocation rule to include generic materials.
  Material Master Configuration: Verify the settings in the material master for the generic material. Ensure that it is set up correctly and that it allows for the operations you are trying to perform.
  Use Specific Materials: If possible, consider using specific materials instead of generic materials for the allocation process. This may involve creating specific material numbers for the items you are working with.
  Consult Documentation: Refer to SAP documentation or help resources for more detailed information on handling generic materials and allocation rules.
  Contact SAP Support: If the issue persists, consider reaching out to SAP support for assistance. They can provide guidance based on your specific configuration and requirements.
  
  Related Information:
  
  Generic Material: In SAP, a generic material is often used in scenarios where the exact specifications of a product are not known or when dealing with a range of similar products.
  Allocation Rules: These are defined in the system to determine how stock is allocated to different orders or requirements. They can be based on various criteria, including priority, availability, and material type.
  Material Master Data: This is a critical component in SAP that contains all the information related to materials, including descriptions, units of measure, and other relevant data.
  
  By addressing the configuration and ensuring that the correct allocation rules are in place, you should be able to resolve the MW428 error.