How To Fix MM126 - The maintenance of manufacturer parts has not been activated

SAP Error Message - Details

• Message type: E = Error

• Message class: MM - Messages for material master maintenance and Customizing

• Message number: 126

• Message text: The maintenance of manufacturer parts has not been activated

What causes this issue?

You wanted to maintain <DS:GLOS.manufacturer_part>manufacturer
parts</>. However, the corresponding indicator allowing this has not
been set in Customizing.

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?

Ask your system administrator to set the <LS>Manufacturer part
number</> indicator in Customizing for the <LS>Material Master</> in
the IMG activity <LS>Make global settings</>.
<DS:TRAN.OMT0>Proceed</>

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MM126 - The maintenance of manufacturer parts has not been activated ?

  The SAP error message MM126, which states "The maintenance of manufacturer parts has not been activated," typically occurs in the Materials Management (MM) module when you attempt to perform actions related to manufacturer parts without having the necessary configuration enabled.
  Cause:
  The error is caused by the fact that the system settings for managing manufacturer parts (also known as vendor parts or manufacturer data) have not been activated in the SAP system. This can happen if the relevant configuration settings in the system have not been set up or if the necessary authorizations are not in place.
  Solution:
  To resolve the MM126 error, you need to activate the maintenance of manufacturer parts in the SAP system. Here are the steps to do this:
  
  
  Access the Customizing Settings:
  
  Go to the SAP Easy Access screen and enter the transaction code SPRO to access the SAP Reference IMG (Implementation Guide).
  
  
  
  Navigate to the Relevant Configuration:
  
  Follow the path: Materials Management -> Purchasing -> Vendor Master -> General Data -> Define Manufacturer Parts.
  
  
  
  Activate Manufacturer Parts:
  
  In the configuration settings, ensure that the option for maintaining manufacturer parts is activated. This may involve checking specific settings or flags that enable the functionality.
  
  
  
  Check Authorizations:
  
  Ensure that the user has the necessary authorizations to maintain manufacturer parts. This may involve checking user roles and authorizations in the user management area.
  
  
  
  Save Changes:
  
  After making the necessary changes, save your configuration.
  
  
  
  Test the Functionality:
  
  After activation, try to perform the action that previously resulted in the MM126 error to confirm that the issue has been resolved.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  MM01: Create Material
  MM02: Change Material
  MM03: Display Material
  ME11: Create Purchasing Info Record
  ME12: Change Purchasing Info Record
  
  
  
  Documentation:
  
  Refer to SAP Help documentation for detailed information on managing manufacturer parts and vendor master data.
  
  
  
  Support:
  
  If the issue persists after following the above steps, consider reaching out to your SAP Basis or MM functional team for further assistance. They may need to check for additional configuration or system issues.
  
  
  
  By following these steps, you should be able to resolve the MM126 error and successfully manage manufacturer parts in your SAP system.