How To Fix WM166 - Variant &2 of generic material &1 already assigned in module &3

SAP Error Message - Details

• Message type: E = Error

• Message class: WM - IS-R Assortments

• Message number: 166

• Message text: Variant &2 of generic material &1 already assigned in module &3

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WM166 - Variant &2 of generic material &1 already assigned in module &3 ?

  The SAP error message WM166 indicates that a variant of a generic material has already been assigned in a specific module. This typically occurs in the Warehouse Management (WM) module when you are trying to assign a variant of a generic material that is already in use or assigned elsewhere in the system.
  Cause:
  
  Duplicate Assignment: The specific variant of the generic material is already assigned to another location, storage type, or process within the WM module.
  Configuration Issues: There may be configuration settings that prevent the assignment of the same variant to multiple locations or processes.
  Data Integrity: The system may have integrity checks that prevent the same variant from being assigned to multiple transactions or locations to avoid confusion and errors in inventory management.
  
  Solution:
  
  Check Existing Assignments: Review the current assignments of the generic material variant in the system. You can do this by navigating to the relevant transaction codes (like WM or IM) to see where the variant is currently assigned.
  Change Assignment: If the variant is assigned to a location or process that is no longer needed, you may need to unassign it before reassigning it to the desired location or process.
  Use a Different Variant: If the variant is indeed needed in multiple locations, consider using a different variant of the generic material that is not currently assigned.
  Consult Documentation: Review the SAP documentation or configuration settings related to generic materials and variants to ensure that you are following the correct procedures for assignment.
  Contact Support: If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as LT03 (Transfer Order), LT12 (Confirm Transfer Order), and others related to Warehouse Management.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Roles and Permissions: Ensure that you have the necessary permissions to make changes to material assignments in the WM module.
  Training and Documentation: Review training materials or documentation related to Warehouse Management processes to better understand how to manage generic materials and their variants.
  
  By following these steps, you should be able to identify the cause of the WM166 error and implement a solution to resolve it.