How To Fix CO138 - Quantity unit & is not defined, since StUn cannot convert into issue unit

SAP Error Message - Details

• Message type: E = Error

• Message class: CO - PPC order processing messages

• Message number: 138

• Message text: Quantity unit & is not defined, since StUn cannot convert into issue unit

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 CO138 - Quantity unit & is not defined, since StUn cannot convert into issue unit ?

  The SAP error message CO138 indicates that there is an issue with the quantity unit in a production order or a related process. Specifically, it means that the system cannot convert the specified quantity unit into the issue unit because the conversion is not defined in the system. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause:
  
  Missing Unit of Measure (UoM) Definition: The unit of measure (UoM) for the material or component is not defined in the system. This can happen if the material master data is incomplete or incorrectly configured.
  Conversion Factor Not Defined: There may be no conversion factor defined between the stock unit (StUn) and the issue unit (the unit you are trying to use).
  Incorrect Material Master Data: The material master may have incorrect settings or missing information related to units of measure.
  Configuration Issues: There may be issues in the configuration of the material types or the relevant settings in the SAP system.
  
  Solutions:
  
  
  Check Material Master Data:
  
  Go to the material master (transaction code MM03) and check the units of measure defined for the material.
  Ensure that the stock unit and the issue unit are correctly defined.
  
  
  
  Define Conversion Factors:
  
  If the conversion factor is missing, you can define it in the material master under the "Units of Measure" view.
  Ensure that the conversion from the stock unit to the issue unit is properly set up.
  
  
  
  Review Configuration Settings:
  
  Check the configuration settings in the SAP system related to units of measure. This can be done through transaction code SPRO.
  Navigate to the relevant configuration path: Logistics > General > Master Data > Units of Measure and ensure that the necessary settings are in place.
  
  
  
  Check for Customizations:
  
  If there are any custom developments or enhancements in your SAP system, ensure that they are not interfering with the standard unit of measure functionality.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources for additional guidance on handling unit of measure issues.
  
  
  
  Related Information:
  
  Transaction Codes:
  
  MM03: Display Material Master
  MM02: Change Material Master
  SPRO: Customizing Implementation Guide
  
  
  Unit of Measure Types: Understand the different types of units of measure (e.g., base unit, alternative unit) and how they relate to each other.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to unit of measure conversions.
  
  By following these steps, you should be able to identify and resolve the issue causing the CO138 error message in SAP. If the problem persists, consider reaching out to your SAP support team for further assistance.