How To Fix /SCMB/ODM_ORDA420 - A read lock for &1 has already been requested in the same session

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCMB/ODM_ORDA -

• Message number: 420

• Message text: A read lock for &1 has already been requested in the same session

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCMB/ODM_ORDA420 - A read lock for &1 has already been requested in the same session ?

  The SAP error message /SCMB/ODM_ORDA420 A read lock for &1 has already been requested in the same session typically occurs in the context of the SAP Supply Chain Management (SCM) module, particularly when dealing with object locks in the system. This error indicates that a read lock for a specific object (denoted by &1) has already been requested in the same session, and the system does not allow multiple requests for the same lock.
  Cause:
  
  Multiple Lock Requests: The most common cause of this error is that the application is trying to acquire a read lock on the same object multiple times within the same session. This can happen if the code logic inadvertently attempts to lock the same object again without releasing the previous lock.
  Concurrency Issues: If multiple processes or threads are trying to access the same object simultaneously, it can lead to locking conflicts.
  Long-Running Transactions: If a transaction takes a long time to complete, it may hold onto the lock longer than expected, causing subsequent requests to fail.
  
  Solution:
  
  Check Code Logic: Review the code to ensure that it is not attempting to acquire the same lock multiple times unnecessarily. If a lock is already held, you may want to skip the lock request or handle it differently.
  Release Locks: Ensure that locks are released properly after their use. This can be done by using appropriate commit or rollback statements in your code.
  Use Different Sessions: If you need to access the same object multiple times, consider using different sessions or transactions to avoid lock conflicts.
  Error Handling: Implement error handling in your code to manage situations where a lock cannot be acquired. This could involve retrying the operation after a short delay or logging the error for further investigation.
  Review Transaction Design: If the error occurs frequently, consider reviewing the design of your transactions to minimize the duration for which locks are held.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error. SAP frequently updates its knowledge base with solutions for common problems.
  Transaction Codes: Use transaction codes like SM12 to monitor and manage locks in the system. This can help you identify which locks are currently held and by which users or processes.
  Performance Monitoring: Monitor the performance of your transactions to identify any long-running processes that may be contributing to the locking issue.
  
  By addressing the underlying causes and implementing the suggested solutions, you should be able to resolve the error and improve the overall performance of your SAP SCM processes.