How To Fix M3428 - Fixed lot size and minimum lot size not possible in a single profile

SAP Error Message - Details

• Message type: E = Error

• Message class: M3 - Material Master

• Message number: 428

• Message text: Fixed lot size and minimum lot size 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 M3428 - Fixed lot size and minimum lot size not possible in a single profile ?

  The SAP error message M3428 indicates that there is a conflict in the configuration of lot sizes for a material in the system. Specifically, it arises when you attempt to set both a fixed lot size and a minimum lot size in the same lot size profile, which is not allowed.
  Cause:
  
  
  Configuration Conflict: The error occurs because the system does not allow a lot size profile to have both a fixed lot size and a minimum lot size defined simultaneously. A fixed lot size means that the system will always produce or order a specific quantity, while a minimum lot size indicates the smallest quantity that can be produced or ordered. These two settings are inherently contradictory.
  
  
  Material Master Settings: The error may also stem from the settings in the material master record, particularly in the MRP (Material Requirements Planning) views where lot size profiles are defined.
  
  
  Solution:
  To resolve the M3428 error, you need to adjust the lot size profile settings in the material master or the relevant configuration settings. Here are the steps to do so:
  
  
  Review Lot Size Profile:
  
  Go to the transaction code OMZB (for lot size profiles) or MM02 (to change the material master).
  Check the lot size profile assigned to the material and see if it has both a fixed lot size and a minimum lot size defined.
  
  
  
  Modify Lot Size Settings:
  
  If both settings are present, you need to decide which one is appropriate for your business needs.
  If you want to use a fixed lot size, remove the minimum lot size setting.
  Conversely, if you need a minimum lot size, remove the fixed lot size setting.
  
  
  
  Save Changes: After making the necessary adjustments, save the changes and re-run the process that triggered the error.
  
  
  Testing: After making the changes, test the material planning or procurement process to ensure that the error no longer occurs.
  
  
  Related Information:
  
  
  Lot Size Types: Familiarize yourself with different types of lot sizes in SAP, such as:
  
  Fixed Lot Size: A specific quantity that is always produced or ordered.
  Minimum Lot Size: The smallest quantity that can be produced or ordered.
  Maximum Lot Size: The largest quantity that can be produced or ordered.
  Lot-for-Lot: Producing or ordering exactly what is needed for a specific requirement.
  
  
  
  Material Master Views: Understand the different views in the material master, especially the MRP view, where lot size profiles are defined.
  
  
  SAP Documentation: Refer to SAP Help documentation for detailed information on lot size profiles and their configurations.
  
  
  By following these steps and understanding the underlying concepts, you should be able to resolve the M3428 error effectively.