How To Fix M3426 - Fixed lot size and maximum stock level not possible in a single profile

SAP Error Message - Details

• Message type: E = Error

• Message class: M3 - Material Master

• Message number: 426

• Message text: Fixed lot size and maximum stock level not possible in a single profile

Self-Explanatory Message

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• What is the cause and solution for SAP error message M3426 - Fixed lot size and maximum stock level not possible in a single profile ?

  The SAP error message M3426, which states "Fixed lot size and maximum stock level not possible in a single profile," typically occurs in the context of material requirements planning (MRP) and inventory management. This error indicates a configuration issue in the material master data, specifically in the lot size settings for a material.
  Cause:
  The error arises when there is a conflict in the lot size settings for a material. In SAP, you can define different lot size types for production and procurement, such as:
  
  Fixed Lot Size: A fixed quantity that is produced or procured each time.
  Maximum Stock Level: A limit on the maximum quantity of stock that can be held.
  
  When both a fixed lot size and a maximum stock level are defined in the same lot size profile, SAP cannot process the request because these two settings are incompatible. Essentially, if you have a fixed lot size, it contradicts the idea of having a maximum stock level, as the fixed lot size would always aim to produce or procure a specific quantity regardless of the stock level.
  Solution:
  To resolve this error, you need to adjust the lot size settings in the material master record. Here are the steps to do this:
  
  
  Access the Material Master:
  
  Use transaction code MM02 to change the material master data.
  
  
  
  Select the Appropriate Views:
  
  Navigate to the "MRP" view or the relevant view where the lot size settings are defined.
  
  
  
  Check Lot Size Settings:
  
  Review the lot size settings. If a fixed lot size is defined, consider removing the maximum stock level or vice versa.
  You can either:
  
  Change the lot size type to a variable lot size if you want to keep the maximum stock level.
  Remove the maximum stock level if you want to keep the fixed lot size.
  
  
  
  
  
  Save Changes:
  
  After making the necessary adjustments, save the changes to the material master.
  
  
  
  Test the Configuration:
  
  Run the MRP or relevant transaction again to ensure that the error no longer occurs.
  
  
  
  Related Information:
  
  
  Lot Size Types: Familiarize yourself with different lot size types available in SAP, such as:
  
  Lot-for-lot (L4L): Produces or procures exactly what is needed.
  Fixed lot size: Always produces or procures a fixed quantity.
  Reorder point: Triggers procurement when stock falls below a certain level.
  
  
  
  Material Master Views: Understand the different views in the material master, especially the MRP view, as it contains critical settings for planning and inventory management.
  
  
  SAP Documentation: Refer to SAP Help documentation for detailed explanations of lot size settings and their implications on MRP.
  
  
  By following these steps and understanding the underlying concepts, you should be able to resolve the M3426 error effectively.