How To Fix CNV_OM_PRESEL026 - Not all preselection tasks have been completed successfully!

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 026

• Message text: Not all preselection tasks have been completed successfully!

Self-Explanatory Message

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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_PRESEL026 - Not all preselection tasks have been completed successfully! ?

  The SAP error message CNV_OM_PRESEL026 indicates that not all preselection tasks in a conversion or migration process have been completed successfully. This error typically arises during data migration activities, particularly when using SAP's Conversion and Migration tools, such as the SAP S/4HANA Migration Cockpit or other data migration solutions.
  Cause:
  The error can be caused by several factors, including:
  
  
  Incomplete Preselection Tasks: Some of the preselection tasks required for the migration process have not been executed or completed successfully. This could be due to missing data, incorrect configurations, or other issues in the source system.
  
  
  Data Quality Issues: There may be data inconsistencies or quality issues in the source data that prevent the preselection tasks from completing.
  
  
  Configuration Errors: Incorrect settings or configurations in the migration tool or the source system can lead to failures in the preselection tasks.
  
  
  Authorization Issues: The user executing the migration may not have the necessary authorizations to complete all preselection tasks.
  
  
  Solution:
  To resolve the error CNV_OM_PRESEL026, you can follow these steps:
  
  
  Check Preselection Task Status: Review the status of all preselection tasks in the migration cockpit or tool you are using. Identify which tasks have failed and why.
  
  
  Review Logs and Messages: Look at the detailed logs and messages associated with the preselection tasks. This can provide insights into what went wrong and help you address specific issues.
  
  
  Data Quality Checks: Perform data quality checks on the source data. Ensure that the data meets the requirements for migration and that there are no inconsistencies or missing values.
  
  
  Re-run Preselection Tasks: After addressing any identified issues, re-run the preselection tasks that failed. Ensure that all tasks complete successfully before proceeding with the migration.
  
  
  Check Authorizations: Ensure that the user executing the migration has the necessary authorizations to perform all required tasks.
  
  
  Consult Documentation: Refer to the official SAP documentation for the migration tool you are using. There may be specific guidelines or troubleshooting steps related to the error.
  
  
  Seek Support: If the issue persists, consider reaching out to SAP support or consulting with an SAP expert who can provide assistance based on the specific context of your migration project.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Migration Cockpit Documentation: Review the official SAP documentation for the Migration Cockpit or the specific tool you are using for detailed guidance on preselection tasks and error handling.
  Community Forums: Engage with the SAP Community or other forums where SAP professionals discuss similar issues. You may find solutions or workarounds shared by others who have encountered the same error.
  
  By following these steps, you should be able to identify the root cause of the error and take appropriate actions to resolve it.