How To Fix CNV_OT_PCL020 - Blocking preselection task &1

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_OT_PCL - Messages for PCL of generic OBT parts

• Message number: 020

• Message text: Blocking preselection task &1

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_OT_PCL020 - Blocking preselection task &1 ?

  The SAP error message CNV_OT_PCL020 typically occurs during the execution of a preselection task in the SAP system, particularly in the context of data migration or conversion projects. This error indicates that the preselection task is being blocked, which can happen for various reasons.
  Causes:
  
  Locking Issues: The task may be blocked due to locks on the database tables that are being accessed. This can happen if another process is currently using the same resources.
  Long-Running Processes: If there are long-running background jobs or processes that are accessing the same data, they can prevent the preselection task from executing.
  Configuration Issues: Incorrect configuration settings in the migration or conversion tools can lead to blocking issues.
  Insufficient Authorizations: The user executing the task may not have the necessary authorizations to perform the operation, leading to a blockage.
  
  Solutions:
  
  Check for Locks: Use transaction codes like SM12 to check for any locks on the relevant database tables. If you find locks, you may need to wait for the other processes to complete or manually release the locks if appropriate.
  Monitor Background Jobs: Use transaction code SM37 to monitor background jobs. If there are jobs that are taking too long, you may need to analyze and optimize them or terminate them if they are no longer needed.
  Review Configuration: Ensure that the configuration settings for the migration or conversion project are correct. This may involve checking the settings in the relevant transaction codes or tools.
  Check Authorizations: Verify that the user executing the task has the necessary authorizations. You can do this by checking the user roles and profiles in transaction code SU01 or PFCG.
  Restart the Task: Sometimes, simply restarting the preselection task can resolve temporary issues.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (for locks), SM37 (for job monitoring), and SU01 (for user management).
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Documentation: Review the documentation for the specific migration or conversion tool you are using, as it may contain specific guidance on handling errors like CNV_OT_PCL020.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP Basis team or reach out to SAP support for further assistance.