How To Fix MW255 - Allocation rule type with proportion category 'E' & is not allowed here

MW255 - Overview

• Message type: E = Error

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

• Message number: 255

• Message text: Allocation rule type with proportion category 'E' & is not allowed here

What causes this issue?

You can only create allocation rules using quota category 'E' &V1&
manually. They are only intended for use with allocation strategies.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Use another allocation rule type with a different quota category.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MW255 - Allocation rule type with proportion category 'E' & is not allowed here ?

  The SAP error message MW255 indicates that there is an issue with the allocation rule type that is being used in a particular context, specifically when the proportion category 'E' (which typically stands for "Equal") is not allowed. This error often arises in the context of inventory management or material requirements planning (MRP) when trying to allocate stock or resources.
  
  Cause:
  
  Incorrect Allocation Rule: The allocation rule type being used is not compatible with the context in which it is being applied. For example, if the system expects a different type of allocation rule for a specific transaction or process, using 'E' will trigger this error.
  
  Configuration Issues: The configuration settings in the SAP system may not allow for the use of proportion category 'E' in the current scenario. This could be due to settings in the material master, allocation strategy, or other related configurations.
  Data Inconsistencies: There may be inconsistencies in the data