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

VMP_MSG129 - Overview

• 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