How To Fix MAT_MESSAGES021 - UoM '&1': Conversion error '&2'

SAP Error Message - Details

• Message type: E = Error

• Message class: MAT_MESSAGES -

• Message number: 021

• Message text: UoM '&1': Conversion error '&2'

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 MAT_MESSAGES021 - UoM '&1': Conversion error '&2' ?

  The SAP error message MAT_MESSAGES021 indicates a unit of measure (UoM) conversion error. This typically occurs when there is an issue with converting quantities between different units of measure in the system. The error message format is as follows:
  
  UoM '&1': This part of the message specifies the unit of measure that is causing the issue.
  Conversion error '&2': This part provides additional details about the nature of the conversion error.
  
  Causes
  
  Missing Conversion Factors: The conversion factors between the specified UoMs may not be defined in the system.
  Incorrect UoM Configuration: The UoM may not be correctly configured in the material master or in the relevant settings.
  Inconsistent Data: There may be inconsistencies in the data related to the material, such as incorrect UoM assignments or missing data in the material master.
  Unit of Measure Group Issues: The UoM group assigned to the material may not include the necessary UoMs for conversion.
  
  Solutions
  
  
  Check UoM Configuration:
  
  Go to the material master (transaction code MM03) and check the UoM settings for the material in question.
  Ensure that the UoM is correctly defined and that the conversion factors are set up properly.
  
  
  
  Define Conversion Factors:
  
  If conversion factors are missing, you can define them in the material master or through the relevant configuration settings (transaction code OMT3).
  Ensure that the conversion factors between the UoMs are correctly specified.
  
  
  
  Review Unit of Measure Groups:
  
  Check the UoM group assigned to the material and ensure that it includes all necessary UoMs for conversion.
  You can review and modify UoM groups in the configuration settings.
  
  
  
  Data Consistency Check:
  
  Perform a consistency check on the material data to identify any discrepancies or missing information.
  Use transaction codes like MM02 to make necessary corrections.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources for specific details related to UoM conversion errors.
  
  
  
  Related Information
  
  Transaction Codes:
  
  MM03: Display Material Master
  MM02: Change Material Master
  OMT3: Maintain Units of Measure
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to UoM conversion errors.
  User Forums: Consider visiting SAP community forums or user groups 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 MAT_MESSAGES021 error in SAP.