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

SAP Error Message - Details

• 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 related to the materials or the allocation rules that are set up in the system.
  
  Solution:
  
  Check Allocation Rule Type: Review the allocation rule type being used in the transaction. Ensure that it is appropriate for the context. If 'E' is not allowed, consider using a different allocation rule type that is compatible.
  Review Configuration Settings: Go to the configuration settings in the SAP system (transaction SPRO) and check the settings related to allocation rules and proportion categories. Make sure that the settings allow for the use of the desired allocation rule type.
  Adjust Material Master Data: If the error is related to specific materials, check the material master data for any inconsistencies or incorrect settings that might be causing the issue.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on allocation rules and their allowed contexts. This can provide insights into what types of allocation rules are permissible in different scenarios.
  Testing: After making changes, perform tests to ensure that the error is resolved and that the allocation process works as expected.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MM01 (Create Material), MM02 (Change Material), and SPRO (Customizing).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP Notes can provide specific fixes or workarounds.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed. Other users may have encountered the same error and can provide insights or solutions.
  
  By following these steps, you should be able to identify the cause of the MW255 error and implement a solution to resolve it.