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

MW428 - Overview

• 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.

MW428 - Details

• 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