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

WU638 - Overview

• 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.

WU638 - Details

• 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