How To Fix C$149 - Cannot lock &

SAP Error Message - Details

• Message type: E = Error

• Message class: C$ -

• Message number: 149

• Message text: Cannot lock &

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message C$149 - Cannot lock & ?

  The SAP error message C$149 "Cannot lock &" typically indicates that the system is unable to acquire a lock on a particular object or resource. This can happen for various reasons, and understanding the cause is essential for resolving the issue.
  Causes:
  
  Object Already Locked: The object you are trying to access is already locked by another user or process. This is common in scenarios where multiple users are trying to edit the same data simultaneously.
  Session Timeout: If a user session has timed out, it may still hold locks on certain objects until the session is cleared.
  Database Lock Table Full: The lock table in the database may be full, preventing new locks from being created.
  System Configuration Issues: There may be configuration issues in the SAP system that affect locking mechanisms.
  Transport Requests: If you are working with transport requests, locks may be held by the transport management system.
  
  Solutions:
  
  Check Lock Entries: Use transaction code SM12 to check for existing lock entries. You can identify the user or process that is holding the lock and take appropriate action (e.g., ask the user to release the lock).
  Release Locks: If you have the necessary authorizations, you can manually delete the lock entries in SM12. Be cautious with this approach, as it may disrupt other users.
  Wait and Retry: If the lock is temporary, waiting for a few moments and then retrying the operation may resolve the issue.
  Session Management: Ensure that user sessions are properly managed and that users log off when they are done to release locks.
  Check System Performance: If the lock table is full, consider checking the system performance and configuration. You may need to increase the size of the lock table or optimize the locking strategy.
  Consult Basis Team: If the issue persists, consult your SAP Basis team for further investigation. They can check system logs and configurations that may be causing the locking issue.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (Lock Entries), SM21 (System Log), and ST22 (Dump Analysis) for troubleshooting.
  SAP Notes: Check SAP Notes for any known issues or patches related to locking mechanisms in your version of SAP.
  User Training: Ensure that users are trained on proper session management and the importance of releasing locks when they are done with their tasks.
  
  By following these steps, you should be able to diagnose and resolve the "Cannot lock &" error in SAP.