How To Fix WRF_WSUBST039 - Quantity determination not possible; substitution material &1, unit &2

SAP Error Message - Details

• Message type: E = Error

• Message class: WRF_WSUBST - Article Substitution: Messages Central Determination Logic

• Message number: 039

• Message text: Quantity determination not possible; substitution material &1, unit &2

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 WRF_WSUBST039 - Quantity determination not possible; substitution material &1, unit &2 ?

  The SAP error message WRF_WSUBST039 indicates that the system is unable to determine the quantity for a substitution material. This typically occurs in the context of material substitution in SAP, where one material can be substituted for another under certain conditions.
  Cause:
  The error can arise due to several reasons, including:
  
  Missing Substitution Data: The substitution material may not have been properly defined in the system, or the necessary substitution rules may not be set up.
  Unit of Measure Issues: The unit of measure for the substitution material may not match the unit of measure for the original material, leading to difficulties in quantity determination.
  Configuration Issues: There may be configuration issues in the material master or in the substitution settings that prevent the system from determining the correct quantity.
  Stock Availability: The substitution material may not have sufficient stock available to fulfill the requirement.
  Invalid Material Status: The substitution material may be in a status that does not allow it to be used for substitution (e.g., blocked or inactive).
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check Substitution Configuration:
  
  Go to the material master of the substitution material and ensure that the substitution settings are correctly configured.
  Verify that the substitution material is defined in the relevant substitution list.
  
  
  
  Verify Unit of Measure:
  
  Check the unit of measure for both the original and substitution materials. Ensure that they are compatible or that conversion factors are defined if they differ.
  
  
  
  Review Stock Levels:
  
  Check the stock levels of the substitution material to ensure that there is enough available to meet the demand.
  
  
  
  Material Status:
  
  Ensure that the substitution material is active and not blocked or inactive in the system.
  
  
  
  Test Substitution:
  
  Perform a test substitution in a controlled environment to see if the error persists. This can help identify if the issue is with specific materials or a broader configuration issue.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources related to material substitution for any additional configuration or setup steps that may be required.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above points, consider reaching out to SAP support for further assistance, providing them with the error message details and any relevant configuration information.
  
  
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like MM03 (Display Material), MM02 (Change Material), or WRF1 (Maintain Substitution) to check and modify material settings.
  Material Master Views: Ensure that the relevant views (Basic Data, Sales Org Data, etc.) for both the original and substitution materials are correctly maintained.
  Substitution Strategy: Understand the substitution strategy being used in your organization, as this can affect how substitutions are processed.
  
  By following these steps, you should be able to identify and resolve the cause of the error message WRF_WSUBST039 in SAP.