How To Fix /PF1/MSG_LOG_GUI156 - Error during reservation due to locks in AM; retry &1

SAP Error Message - Details

• Message type: E = Error

• Message class: /PF1/MSG_LOG_GUI -

• Message number: 156

• Message text: Error during reservation due to locks in AM; retry &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /PF1/MSG_LOG_GUI156 - Error during reservation due to locks in AM; retry &1 ?

  The SAP error message /PF1/MSG_LOG_GUI156 typically indicates that there is a lock issue when trying to create or modify a reservation in the Asset Management (AM) module. This error occurs when the system is unable to access the required data because it is currently locked by another user or process.
  Cause:
  
  Locking Mechanism: SAP uses a locking mechanism to prevent data inconsistencies. If another user or transaction is currently accessing the same asset or reservation, it can lead to this error.
  Long-running Transactions: If a transaction takes too long to complete, it may hold locks longer than expected, causing other transactions to fail.
  Batch Jobs: Background jobs that are processing data in the same area can also lead to locks.
  Database Locks: Sometimes, database-level locks can occur due to various reasons, including deadlocks or long-running queries.
  
  Solution:
  
  Retry the Operation: The simplest solution is to wait for a few moments and then retry the operation. The lock may be released once the other transaction completes.
  Check for Locks: Use transaction code SM12 to check for existing locks. You can see which users or processes are holding locks on the relevant objects. If you find a lock that is no longer needed, you can delete it (if you have the necessary authorizations).
  Analyze Long-running Transactions: Use transaction code SM66 to monitor active processes and identify any long-running transactions that may be causing locks.
  Communicate with Users: If you identify a specific user or process causing the lock, communicate with them to understand if they can release the lock or if they are done with their transaction.
  Review Batch Jobs: Check if there are any batch jobs running that might be causing locks and schedule them during off-peak hours if necessary.
  Increase Lock Timeout: If this is a frequent issue, consider discussing with your SAP Basis team about increasing the lock timeout settings, although this should be done with caution.
  
  Related Information:
  
  Transaction Codes:
  
  SM12: Display and manage locks.
  SM66: Global overview of active processes.
  SM21: System log to check for any related errors or warnings.
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Documentation: Review SAP documentation for Asset Management to understand how reservations work and the locking mechanisms involved.
  
  If the issue persists after trying the above solutions, it may be necessary to involve your SAP Basis team or SAP support for further investigation.