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

M3491 - Overview

• 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.

M3491 - Details

• 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