How To Fix CNV_OM_MWBGEN018 - Preselection table &1 can not be created

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_OM_MWBGEN - SLO: Messages for Object Based MBW Generation

• Message number: 018

• Message text: Preselection table &1 can not be created

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_MWBGEN018 - Preselection table &1 can not be created ?

  The SAP error message CNV_OM_MWBGEN018 indicates that a preselection table cannot be created during a data migration or conversion process. This error typically arises in the context of SAP's data migration tools, such as the SAP S/4HANA Migration Cockpit or other data conversion scenarios.
  Causes:
  
  Database Issues: There may be issues with the underlying database, such as insufficient permissions, lack of space, or database connectivity problems.
  Configuration Errors: The configuration settings for the migration or conversion process may be incorrect or incomplete.
  Missing Objects: Required database objects (like tables or indexes) may be missing or not properly defined.
  Data Model Issues: The data model being used for the migration may not be compatible with the preselection table being created.
  Transport Issues: If the migration is being executed in a system that has not been properly transported or updated, it may lead to inconsistencies.
  
  Solutions:
  
  Check Database Permissions: Ensure that the user executing the migration has the necessary permissions to create tables in the database.
  Review Configuration: Double-check the configuration settings for the migration process to ensure they are correct and complete.
  Database Space: Verify that there is enough space in the database to create new tables. If necessary, free up space or increase the database size.
  Check for Missing Objects: Use transaction codes like SE11 or SE14 to check if the required database objects exist and are correctly defined.
  Review Logs: Check the application logs (transaction SLG1) for more detailed error messages that can provide additional context on the failure.
  Consult Documentation: Refer to SAP documentation or notes related to the specific migration tool you are using for any known issues or additional troubleshooting steps.
  Contact SAP Support: If the issue persists, consider reaching out to SAP support for assistance, providing them with the error message and any relevant logs.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SE11 (Data Dictionary), SLG1 (Application Log), and ST22 (Dump Analysis) for troubleshooting.
  SAP Notes: Search for SAP Notes related to the error message or the migration tool you are using, as they may contain specific fixes or workarounds.
  Migration Cockpit: If you are using the SAP S/4HANA Migration Cockpit, ensure that you are following the recommended steps and guidelines provided by SAP for data migration.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.