How To Fix M3424 - Fixed lot size requires lot size (materials planning)

SAP Error Message - Details

• Message type: E = Error

• Message class: M3 - Material Master

• Message number: 424

• Message text: Fixed lot size requires lot size (materials planning)

What causes this issue?

You have selected <LS>Fixed lot size</> for copying to the profile, but
it can be copied only if you also specify a lot size in the profile.

How to fix this error?

Select <LS>Lot size (materials planning)</> on the selection screen.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message M3424 - Fixed lot size requires lot size (materials planning) ?

  The SAP error message M3424, which states "Fixed lot size requires lot size," typically occurs in the context of materials planning when there is an issue with the lot size configuration for a material. This error indicates that the system expects a fixed lot size to be defined for the material, but it is either missing or incorrectly configured.
  Cause:
  
  Missing Lot Size Configuration: The material master record does not have a fixed lot size defined in the MRP (Material Requirements Planning) view.
  Incorrect Lot Size Type: The lot size type may not be set correctly, or it may not be compatible with the fixed lot size requirement.
  MRP Type Issues: The MRP type assigned to the material may not support fixed lot sizes.
  Planning Parameters: The planning parameters for the material may not be set up correctly, leading to inconsistencies.
  
  Solution:
  To resolve the M3424 error, you can follow these steps:
  
  
  Check Material Master Data:
  
  Go to the material master record (transaction code MM03).
  Check the MRP view and ensure that a fixed lot size is defined.
  If it is missing, you can add it by using transaction code MM02 to change the material master.
  
  
  
  Define Lot Size:
  
  In the MRP view, ensure that the "Lot Size" field is filled with a valid fixed lot size (e.g., "EX" for fixed lot size).
  Make sure that the lot size type is appropriate for your planning needs.
  
  
  
  Review MRP Type:
  
  Check the MRP type assigned to the material. It should be compatible with fixed lot sizes (e.g., MRP type "PD" for MRP).
  If necessary, change the MRP type using MM02.
  
  
  
  Check Planning Parameters:
  
  Review the planning parameters for the material to ensure they are set correctly.
  Ensure that the "Lot Size" and "Lot Size Procedure" are consistent with your planning strategy.
  
  
  
  Re-run MRP:
  
  After making the necessary changes, re-run the MRP process to see if the error persists.
  
  
  
  Related Information:
  
  Transaction Codes:
  
  MM01: Create Material
  MM02: Change Material
  MM03: Display Material
  MD01: MRP Run
  
  
  Lot Size Types: Familiarize yourself with different lot size types in SAP, such as:
  
  EX (Fixed Lot Size)
  HB (Lot-for-Lot)
  FX (Fixed Order Quantity)
  
  
  MRP Types: Understand the different MRP types and their implications on planning and lot sizing.
  
  By following these steps, you should be able to resolve the M3424 error and ensure that your material planning processes run smoothly. If the issue persists, consider consulting with your SAP support team or a functional consultant for further assistance.