How To Fix M9028 - Not possible to change unit to "blank"

SAP Error Message - Details

• Message type: E = Error

• Message class: M9 - Logistics Information System: Planning Data

• Message number: 028

• Message text: Not possible to change unit to "blank"

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message M9028 - Not possible to change unit to "blank" ?

  The SAP error message M9028, which states "Not possible to change unit to 'blank'," typically occurs in the context of material management or inventory management when there is an attempt to change the unit of measure (UoM) for a material to a blank value. This is not allowed because a material must always have a defined unit of measure.
  Cause:
  
  Invalid Input: The user may have inadvertently tried to set the unit of measure field to blank or empty.
  Configuration Issues: There may be issues in the configuration of the material master data or the unit of measure settings.
  Data Entry Error: A mistake during data entry or data migration could lead to an attempt to save a blank unit of measure.
  
  Solution:
  
  Check Input: Ensure that the unit of measure field is not left blank. Enter a valid unit of measure that is defined in the system.
  Review Material Master Data: Go to the material master record and check the unit of measure settings. Make sure that the UoM is correctly defined and that it is not set to blank.
  Configuration Review: If you have access, review the configuration settings for units of measure in the SAP system. Ensure that the units of measure are properly defined in the relevant tables (e.g., T006 for units of measure).
  Consult Documentation: Refer to SAP documentation or help resources for guidance on how to properly manage units of measure in the material master.
  User Training: If this error is common among users, consider providing training on how to correctly enter and manage material data in SAP.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like MM02 (Change Material) or MM03 (Display Material) to check or modify material master data.
  Unit of Measure Tables: Familiarize yourself with relevant tables such as T006 (Units of Measure) and T001 (Company Codes) to understand how units of measure are structured in your SAP system.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message, as there may be specific fixes or updates provided by SAP.
  
  If the problem persists after following these steps, it may be necessary to consult with your SAP support team or a technical consultant for further assistance.