How To Fix CNV_OM_PRESEL127 - The preselection scheduler was started at &1 &2.

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_OM_PRESEL - Messages for LT Object Based Preselection

• Message number: 127

• Message text: The preselection scheduler was started at &1 &2.

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_OM_PRESEL127 - The preselection scheduler was started at &1 &2. ?

  The SAP error message CNV_OM_PRESEL127 typically relates to issues encountered during the preselection process in the context of data migration or conversion activities, particularly when using the SAP S/4HANA Migration Cockpit or similar tools.
  Cause:
  The error message CNV_OM_PRESEL127 indicates that the preselection scheduler was started at a specific time (denoted by &1 &2), but it may not have completed successfully. This can occur due to several reasons, including:
  
  Resource Limitations: Insufficient system resources (CPU, memory, etc.) can lead to the scheduler not being able to complete its tasks.
  Configuration Issues: Incorrect configuration settings in the migration cockpit or related tools may prevent the scheduler from functioning properly.
  Data Volume: Large volumes of data being processed can lead to timeouts or performance issues.
  Locking Issues: Database locks or contention can prevent the scheduler from accessing the necessary data.
  Background Job Failures: If the preselection scheduler is running as a background job, it may fail due to errors in the job itself.
  
  Solution:
  To resolve the error CNV_OM_PRESEL127, you can take the following steps:
  
  Check Job Logs: Review the logs of the preselection scheduler job to identify any specific errors or warnings that may provide more context about the failure.
  Monitor System Resources: Ensure that the system has adequate resources available. Monitor CPU, memory, and disk usage to identify any bottlenecks.
  Review Configuration: Verify that the configuration settings for the migration cockpit or related tools are correct and aligned with the requirements of your data migration project.
  Data Volume Management: If you are processing a large volume of data, consider breaking it down into smaller batches to reduce the load on the system.
  Check for Locks: Use transaction codes like SM12 to check for any database locks that may be affecting the scheduler's ability to access data.
  Restart the Scheduler: If the issue persists, you may need to restart the preselection scheduler or the entire migration process.
  Consult SAP Notes: Look for any relevant SAP Notes or documentation that may address this specific error message or provide additional troubleshooting steps.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM37 (to check job status), SM21 (to view system logs), and ST22 (to analyze dumps).
  SAP Support: If the issue cannot be resolved through the above steps, consider reaching out to SAP Support for assistance, providing them with detailed logs and error messages.
  Documentation: Review the official SAP documentation for the migration cockpit or data migration tools for best practices and troubleshooting guidelines.
  
  By following these steps, you should be able to diagnose and resolve the CNV_OM_PRESEL127 error effectively.