How To Fix M3491 - Unit of measure & is not defined as a commercial unit

SAP Error Message - Details

• Message type: E = Error

• Message class: M3 - Material Master

• Message number: 491

• Message text: Unit of measure & is not defined as a commercial unit

What causes this issue?

You have entered a unit of measure key that is not defined as a
commercial unit.

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?

Check the definition of the unit of measure.
Authorized users are allowed to maintain or display the units of measure
in Customizing.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message M3491 - Unit of measure & is not defined as a commercial unit ?

  The SAP error message M3491 indicates that the unit of measure (UoM) specified in a transaction is not defined as a commercial unit in the system. This typically occurs when you are trying to perform a transaction that involves inventory management, purchasing, or sales, and the system cannot recognize the unit of measure you are using.
  Cause:
  
  Undefined Unit of Measure: The unit of measure you are trying to use is not defined in the system as a commercial unit.
  Incorrect Configuration: The unit of measure may not be properly configured in the material master or in the relevant settings.
  Master Data Issues: The material master data may not have the correct unit of measure settings.
  
  Solution:
  To resolve the M3491 error, you can follow these steps:
  
  
  Check Unit of Measure Configuration:
  
  Go to the transaction code OMU1 (or OMU2 for changing) to check the unit of measure settings.
  Ensure that the unit of measure you are trying to use is defined as a commercial unit.
  
  
  
  Update Material Master:
  
  Use transaction code MM02 to change the material master data.
  Navigate to the "Basic Data" or "Sales Org. Data" views and check the unit of measure settings.
  Ensure that the unit of measure is included in the list of allowed units for the material.
  
  
  
  Define the Unit of Measure:
  
  If the unit of measure is not defined, you can define it using transaction code CUNI (Unit of Measure Conversion).
  Make sure to set it as a commercial unit if applicable.
  
  
  
  Check Material Type Settings:
  
  Ensure that the material type associated with the material allows for the use of the specified unit of measure.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help files for additional guidance on unit of measure settings and configurations.
  
  
  
  Testing:
  
  After making the necessary changes, test the transaction again to ensure that the error is resolved.
  
  
  
  Related Information:
  
  Commercial Units: In SAP, a commercial unit is a unit of measure that is used for sales and purchasing transactions. It is important for inventory management and sales processes.
  Unit of Measure Groups: Units of measure can be grouped in SAP, and it is essential to ensure that the correct group is assigned to the material.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MM01 (Create Material), MM02 (Change Material), MM03 (Display Material), and CUNI (Unit of Measure Conversion) for managing material master data.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in materials management.