How To Fix WU638 - Allocation of material & &: Entry of allocation rule not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: WU - Promotion management messages

• Message number: 638

• Message text: Allocation of material & &: Entry of allocation rule not allowed

What causes this issue?

Generation of an allocation table with plant quantities only takes
account of the quantities that were assigned to the individual plants.
It is not possible to enter an allocation rule for the material.

How to fix this error?

Delete the allocation rule from the item.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WU638 - Allocation of material & &: Entry of allocation rule not allowed ?

  The SAP error message WU638, which states "Allocation of material & &: Entry of allocation rule not allowed," typically occurs in the context of material allocation processes, particularly when dealing with allocation rules in SAP's logistics or materials management modules.
  Cause:
  
  Invalid Allocation Rule: The allocation rule you are trying to use may not be valid for the material or the context in which you are trying to allocate it.
  Configuration Issues: There may be configuration settings in the system that restrict the use of certain allocation rules for specific materials or scenarios.
  Material Status: The material may have a status that prevents allocation, such as being blocked or not available for allocation.
  Missing Authorizations: The user may not have the necessary authorizations to perform the allocation with the specified rule.
  
  Solution:
  
  Check Allocation Rule: Verify that the allocation rule you are trying to use is valid for the material in question. You can do this by checking the configuration settings in the relevant SAP module (e.g., MM, SD).
  Review Material Status: Ensure that the material is not blocked or restricted in any way that would prevent allocation.
  Consult Configuration: If you have access, check the configuration settings for allocation rules in the SAP system. This may involve looking at the customizing settings in SPRO.
  User Authorizations: Ensure that the user has the necessary authorizations to perform the allocation. This may require coordination with your SAP security team.
  Consult Documentation: Refer to SAP documentation or help resources for specific details on allocation rules and their configurations.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like MM03 (Display Material), SPRO (Customizing), or SE11 (Data Dictionary) to investigate further.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional guidance.
  Support: If the issue persists, consider reaching out to your SAP support team or consulting with SAP experts who can provide more tailored assistance based on your system's configuration.
  
  By following these steps, you should be able to identify the root cause of the WU638 error and implement a solution.