How To Fix W#401 - Conversion of &1 to &2 for material &3 with quantity &4 failed

SAP Error Message - Details

• Message type: E = Error

• Message class: W# -

• Message number: 401

• Message text: Conversion of &1 to &2 for material &3 with quantity &4 failed

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message W#401 - Conversion of &1 to &2 for material &3 with quantity &4 failed ?

  The SAP error message W#401 indicates that there was a failure in converting a quantity of a material from one unit of measure to another. This typically occurs during transactions that involve inventory management, sales order processing, or any other processes where material quantities are handled.
  Cause:
  The error can be caused by several factors, including:
  
  
  Unit of Measure Configuration: The units of measure for the material may not be properly defined 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. For example, if you are trying to convert from kilograms to grams, the conversion factor must be defined correctly.
  
  
  Material Master Data Issues: The material master data may be incomplete or incorrect, leading to issues when trying to convert quantities.
  
  
  Quantity Issues: The quantity being processed may not be valid for the specified unit of measure. For example, trying to convert a fractional quantity that is not allowed.
  
  
  Custom Code or Enhancements: If there are custom developments or enhancements in the system, they may interfere with the standard conversion logic.
  
  
  Solution:
  To resolve the W#401 error, you can take the following steps:
  
  
  Check Material Master Data:
  
  Go to the material master (transaction code MM03) and verify the unit of measure settings.
  Ensure that the base unit of measure and any alternative units of measure are correctly defined.
  
  
  
  Review Conversion Factors:
  
  Check the conversion factors for the material. You can do this in the material master under the "Units of Measure" view.
  Ensure that the conversion factors are correctly set up for all relevant units of measure.
  
  
  
  Validate Quantity:
  
  Ensure that the quantity being processed is valid for the specified unit of measure. Check for any restrictions on the quantity (e.g., must be a whole number).
  
  
  
  Check for Custom Code:
  
  If there are any custom developments or enhancements, review them to ensure they are not causing the issue. You may need to involve your ABAP team for this.
  
  
  
  Test with Different Scenarios:
  
  Try processing the same material with different quantities or units of measure to see if the error persists. This can help isolate the issue.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant notes or updates related to this error message. There may be specific patches or updates that address known issues.
  
  
  
  Related Information:
  
  Transaction Codes: MM03 (Display Material), MM02 (Change Material), and MM01 (Create Material) are useful for checking and updating material master data.
  Unit of Measure Tables: Familiarize yourself with relevant tables such as MARA (General Material Data) and MARM (Units of Measure for Material).
  SAP Community: Engage with the SAP Community forums for additional insights and solutions from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify and resolve the cause of the W#401 error in SAP.