How To Fix M3431 - Fixed lot size and stor. costs indicator not possible in a single profile

SAP Error Message - Details

• Message type: E = Error

• Message class: M3 - Material Master

• Message number: 431

• Message text: Fixed lot size and stor. costs indicator not possible in a single profile

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message M3431 - Fixed lot size and stor. costs indicator not possible in a single profile ?

  The SAP error message M3431 indicates that there is a conflict in the configuration of a material's lot size and storage costs indicator within a single profile. This typically occurs in the context of Material Requirements Planning (MRP) and inventory management when trying to set up a material master record.
  Cause:
  The error arises when you attempt to assign both a fixed lot size and a storage costs indicator that are incompatible within the same material master record. Specifically, this can happen if:
  
  The material is set up with a fixed lot size (e.g., lot-for-lot, fixed lot size) that does not align with the storage cost settings.
  The configuration settings in the material master or the MRP area are not compatible with each other.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Material Master Settings:
  
  Go to the material master record (transaction code MM03) and review the MRP and purchasing views.
  Ensure that the lot size and storage costs indicator settings are compatible. You may need to adjust one of these settings.
  
  
  
  Adjust Lot Size or Storage Costs:
  
  If you are using a fixed lot size, consider changing the storage costs indicator to one that is compatible with fixed lot sizes.
  Alternatively, if the storage costs indicator is essential, you may need to change the lot size setting to a variable lot size or another type that aligns with the storage costs.
  
  
  
  Review MRP Area Settings:
  
  If applicable, check the MRP area settings to ensure that they do not conflict with the material master settings.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help files related to lot sizes and storage costs to understand the specific requirements and limitations.
  
  
  
  Testing:
  
  After making changes, test the configuration by attempting to create a procurement proposal or perform an MRP run to ensure that the error no longer occurs.
  
  
  
  Related Information:
  
  Transaction Codes: MM01 (Create Material), MM02 (Change Material), MM03 (Display Material), MD01 (MRP Run).
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance.
  Configuration Guides: Refer to SAP configuration guides for MRP and inventory management for best practices and detailed explanations of settings.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in materials management.