How To Fix MPE_PLAN_MFG_SUB004 - Manufacturing substitute is not assigned

SAP Error Message - Details

• Message type: E = Error

• Message class: MPE_PLAN_MFG_SUB - Manufacturing Substitute

• Message number: 004

• Message text: Manufacturing substitute is not assigned

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 MPE_PLAN_MFG_SUB004 - Manufacturing substitute is not assigned ?

  The SAP error message MPE_PLAN_MFG_SUB004 indicates that a manufacturing substitute has not been assigned for a specific material or product in the planning process. This error typically arises in the context of production planning and material requirements planning (MRP) when the system is unable to find an alternative material or resource that can be used in place of the primary one.
  Cause:
  
  Missing Substitute Assignment: The primary cause of this error is that the system does not have a substitute material defined for the item in question. This can happen if the substitute materials have not been set up in the material master or if they are not properly linked to the primary material.
  Configuration Issues: There may be issues with the configuration settings in the SAP system that prevent the assignment of substitutes.
  Data Inconsistencies: Inconsistencies in the master data, such as missing or incorrect entries in the material master records, can also lead to this error.
  
  Solution:
  
  
  Check Material Master: 
  
  Go to the material master record (transaction code MM03) for the affected material and check the "Substitutes" tab. Ensure that the appropriate substitute materials are defined and assigned.
  If no substitutes are defined, you can add them by editing the material master.
  
  
  
  Define Substitutes:
  
  If you need to create a substitute, you can do this in the material master by navigating to the "Substitutes" section and adding the relevant substitute materials.
  
  
  
  Review Configuration:
  
  Check the configuration settings related to MRP and production planning to ensure that substitutes are enabled and properly configured. This may involve reviewing the settings in the customizing transaction (SPRO).
  
  
  
  Data Consistency Check:
  
  Perform a data consistency check to ensure that there are no discrepancies in the material master records. This can be done using transaction codes like MM02 to edit and verify the data.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for specific guidance on managing substitutes in your version of SAP.
  
  
  
  Contact Support:
  
  If the issue persists after checking the above points, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  MM03 - Display Material Master
  MM02 - Change Material Master
  SPRO - Customizing Implementation Guide
  
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Training and Documentation: Ensure that users involved in material planning and production are trained on how to manage substitutes effectively within the SAP system.
  
  By following these steps, you should be able to resolve the MPE_PLAN_MFG_SUB004 error and ensure that substitutes are properly assigned in your SAP system.