How To Fix VMP_MSG129 - Action cannot be performed; assembly is locked

SAP Error Message - Details

• Message type: E = Error

• Message class: VMP_MSG - VMP Message Manager

• Message number: 129

• Message text: Action cannot be performed; assembly is locked

What causes this issue?

The assembly is locked in the planning scope alternative. Hence, you
cannot modify it.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message VMP_MSG129 - Action cannot be performed; assembly is locked ?

  The SAP error message VMP_MSG129 indicates that an action cannot be performed because the assembly is locked. This typically occurs in the context of SAP's Variant Configuration (VC) or when dealing with assembly processing in production or sales order scenarios.
  Cause:
  The error usually arises due to one of the following reasons:
  
  Locking Mechanism: The assembly or configuration is locked by another user or process. This can happen if another transaction is currently processing the same assembly.
  Incomplete Configuration: The assembly might be in a state where it cannot be modified or processed due to incomplete or incorrect configuration.
  User Permissions: The user may not have the necessary permissions to unlock or modify the assembly.
  System Settings: Certain system settings or configurations may prevent modifications to the assembly.
  
  Solution:
  To resolve the VMP_MSG129 error, you can take the following steps:
  
  
  Check for Locks:
  
  Use transaction code SM12 to check for any locks on the assembly. Look for entries related to the assembly in question and see if another user or process is holding a lock.
  If you find a lock that is no longer needed, you can delete it (if you have the necessary permissions).
  
  
  
  Wait and Retry:
  
  If the assembly is locked by another user, you may need to wait until that user completes their transaction and releases the lock.
  
  
  
  Review Configuration:
  
  Ensure that the assembly is correctly configured and that all required fields are filled out. Check for any missing or incorrect data that might prevent processing.
  
  
  
  User Permissions:
  
  Verify that you have the necessary permissions to perform the action on the assembly. If not, contact your system administrator to obtain the required access.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources related to Variant Configuration and assembly processing for any specific guidelines or troubleshooting steps.
  
  
  
  Contact Support:
  
  If the issue persists after trying the above steps, consider reaching out to your SAP support team or consulting SAP Notes for any known issues related to this error.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as VA01 (Create Sales Order), CO01 (Create Production Order), and SM12 (Display and Delete Locks).
  SAP Notes: Search for SAP Notes related to VMP_MSG129 for any patches or updates that may address this issue.
  User Training: Ensure that users are trained on how to properly handle assemblies and understand the locking mechanisms in place.
  
  By following these steps, you should be able to identify the cause of the error and take appropriate action to resolve it.