How To Fix FRMLDLG398 - Conversion to largest unit was not performed

SAP Error Message - Details

• Message type: E = Error

• Message class: FRMLDLG - RMS-FRM: Dialog Messages for Formula

• Message number: 398

• Message text: Conversion to largest unit was not performed

What causes this issue?

Possible causes:
All units are the same so no conversion is necessary
The dimensions of the units are different so no conversion is possible

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FRMLDLG398 - Conversion to largest unit was not performed ?

  The SAP error message FRMLDLG398, which states "Conversion to largest unit was not performed," typically occurs in the context of unit conversions in SAP, particularly when dealing with material management or production planning. This error indicates that the system was unable to convert a quantity from one unit of measure to another, specifically to the largest unit of measure defined for that material.
  Causes:
  
  Unit of Measure Configuration: The units of measure for the material may not be properly configured in the material master. This includes the base unit of measure and any alternative units of measure.
  Conversion Factors: There may be missing or incorrect conversion factors between the units of measure. If the system cannot find a valid conversion factor, it will not be able to perform the conversion.
  Material Master Data: The material master data may be incomplete or incorrect, particularly in the units of measure section.
  Quantity Issues: The quantity being converted may be zero or negative, which can lead to conversion issues.
  Custom Code or User Exits: If there are custom developments or user exits that manipulate unit conversions, they may be causing the error.
  
  Solutions:
  
  
  Check Material Master Data:
  
  Go to the material master (transaction code MM03) and check the units of measure section.
  Ensure that the base unit of measure and any alternative units of measure are correctly defined.
  
  
  
  Review Conversion Factors:
  
  In the material master, check the conversion factors between the different units of measure. Ensure that they are correctly defined and that there are no missing entries.
  
  
  
  Validate Quantity:
  
  Ensure that the quantity being processed is valid (i.e., not zero or negative).
  
  
  
  Check Configuration:
  
  If you have access to the configuration settings, check the settings for units of measure in the customizing (transaction code SPRO). Ensure that the units of measure are correctly defined and that the conversion factors are set up properly.
  
  
  
  Debugging:
  
  If the issue persists, consider debugging the process to identify where the conversion is failing. This may require technical expertise.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or notes related to unit conversions for any additional insights or known issues.
  
  
  
  Contact SAP Support:
  
  If you are unable to resolve the issue, consider reaching out to SAP support for assistance, especially if this is impacting business processes.
  
  
  
  Related Information:
  
  Transaction Codes: MM03 (Display Material), MM02 (Change Material), SPRO (Customizing).
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance.
  User Forums: Consider searching or posting in SAP community forums for insights from other users who may have encountered the same issue.
  
  By following these steps, you should be able to identify the cause of the FRMLDLG398 error and implement a solution to resolve it.