How To Fix /SCMB/SC_CAL301 - Error during locking

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCMB/SC_CAL -

• Message number: 301

• Message text: Error during locking

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCMB/SC_CAL301 - Error during locking ?

  The SAP error message /SCMB/SC_CAL301 typically indicates an issue related to locking during the execution of a process in the Supply Chain Management (SCM) module, particularly in the context of planning or scheduling activities. This error can occur when a process tries to access a resource that is already locked by another process or user.
  Cause:
  
  Concurrent Access: The most common cause of this error is that another user or process is currently accessing the same data or resource, leading to a locking conflict.
  Long-Running Transactions: If a transaction takes too long to complete, it may hold locks longer than expected, causing subsequent transactions to fail with this error.
  System Configuration: Incorrect configuration of locking mechanisms or settings in the SCM module can also lead to this error.
  Database Issues: Sometimes, underlying database issues can cause locking problems, especially if there are performance bottlenecks.
  
  Solution:
  
  Identify the Lock: Use transaction codes like SM12 (to view and manage locks) to identify which user or process is holding the lock. You can check for the specific object that is locked.
  Wait and Retry: If the lock is held by another user or process, you may need to wait for it to release the lock and then retry the operation.
  Terminate Long-Running Processes: If you identify a long-running transaction that is holding the lock unnecessarily, you may need to terminate it (with caution) to free up the lock.
  Check Configuration: Review the configuration settings related to locking in the SCM module to ensure they are set up correctly.
  Database Performance: If the issue persists, consider checking the database performance and optimizing queries or indexes that may be causing delays.
  Consult SAP Notes: Look for relevant SAP Notes or documentation that may provide additional insights or patches related to this error.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SM12 (to view locks), SM21 (to check system logs), and ST22 (to analyze dumps) for troubleshooting.
  SAP Support: If the issue cannot be resolved internally, consider reaching out to SAP Support for assistance, providing them with detailed information about the error and the context in which it occurs.
  Documentation: Review the official SAP documentation for the SCM module to understand the locking mechanisms and best practices for avoiding locking issues.
  
  By following these steps, you should be able to diagnose and resolve the /SCMB/SC_CAL301 error effectively.