How To Fix LMON066 - Selected resource elements are already blocked

SAP Error Message - Details

• Message type: E = Error

• Message class: LMON - Monitor messages

• Message number: 066

• Message text: Selected resource elements are already blocked

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message LMON066 - Selected resource elements are already blocked ?

  The SAP error message LMON066 indicates that the selected resource elements are already blocked. This typically occurs in the context of resource management, particularly when dealing with logistics or production planning in SAP systems. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause
  
  
  Resource Locking: The error usually arises when a resource (like a machine, work center, or production line) is already locked by another process or user. This can happen if:
  
  Another user is currently using the resource.
  A previous transaction did not release the resource properly.
  There is a system or application-level lock on the resource.
  
  
  
  Concurrent Access: If multiple users or processes are trying to access the same resource simultaneously, it can lead to this error.
  
  
  Configuration Issues: Sometimes, incorrect configuration settings in the resource management module can lead to locking issues.
  
  
  Solution
  
  
  Check Resource Status: 
  
  Verify if the resource is indeed in use by another user or process. You can do this by checking the resource status in the SAP system.
  Use transaction codes like SM12 (to check for locks) or SM21 (to check system logs) to identify if there are any active locks on the resource.
  
  
  
  Release Locks: 
  
  If you find that a lock is held by a user or process that is no longer active, you may need to release the lock manually. This can be done through transaction SM12 where you can delete the lock entries.
  
  
  
  Wait and Retry: If the resource is being used legitimately, you may need to wait until the other process completes its operation and then try again.
  
  
  Review Configuration: 
  
  Check the configuration settings related to resource management to ensure that they are set up correctly. This may involve consulting with your SAP Basis or configuration team.
  
  
  
  Consult Documentation: 
  
  Review SAP documentation or notes related to the specific module you are working with for any known issues or additional troubleshooting steps.
  
  
  
  Contact Support: If the issue persists and you cannot identify the cause, consider reaching out to SAP support for further assistance.
  
  
  Related Information
  
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as:
  
  SM12: To view and manage lock entries.
  SM21: To view system logs for any related errors.
  COHV: For handling production orders and checking their status.
  
  
  
  User Roles: Ensure that users have the appropriate roles and permissions to access and manage the resources in question.
  
  
  System Performance: Sometimes, performance issues can lead to delays in releasing locks. Monitor system performance to ensure it is operating optimally.
  
  
  By following these steps, you should be able to diagnose and resolve the LMON066 error in your SAP environment.