How To Fix CNV_DMC_MC_EXCEPTION143 - Simulation not possible; generate the migration object first

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_MC_EXCEPTION - Exception texts of Migration Object Modeller

• Message number: 143

• Message text: Simulation not possible; generate the migration object first

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_DMC_MC_EXCEPTION143 - Simulation not possible; generate the migration object first ?

  The SAP error message CNV_DMC_MC_EXCEPTION143 with the description "Simulation not possible; generate the migration object first" typically occurs during the data migration process in SAP, particularly when using the SAP Data Migration Cockpit (DMC) or similar tools. This error indicates that the system is unable to perform a simulation of the migration process because the necessary migration object has not been generated.
  Cause:
  
  Migration Object Not Generated: The primary cause of this error is that the migration object required for the simulation has not been created or generated. This is a prerequisite step before you can run simulations or actual data migrations.
  Incorrect Configuration: There may be issues with the configuration settings or parameters that prevent the migration object from being generated.
  Missing Authorization: The user may not have the necessary authorizations to generate the migration object.
  
  Solution:
  
  
  Generate the Migration Object:
  
  Navigate to the relevant transaction or tool in SAP where you can generate the migration object (e.g., SAP Data Migration Cockpit).
  Follow the steps to create or generate the migration object. This usually involves selecting the appropriate source and target systems, defining the data structure, and executing the generation process.
  
  
  
  Check Configuration:
  
  Ensure that all necessary configurations are correctly set up. This includes checking the source and target system connections, data mapping, and any other parameters required for the migration object.
  
  
  
  Review Authorizations:
  
  Verify that the user executing the migration has the necessary authorizations to generate migration objects. If not, consult with your SAP security team to obtain the required permissions.
  
  
  
  Consult Documentation:
  
  Refer to the official SAP documentation or guides related to the Data Migration Cockpit for detailed steps on generating migration objects and troubleshooting common issues.
  
  
  
  Check for Updates:
  
  Ensure that your SAP system is up to date with the latest patches and updates, as there may be bug fixes or improvements related to the migration process.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to the Data Migration Cockpit and the specific error message for any known issues or additional troubleshooting steps.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  Training and Documentation: Consider reviewing training materials or documentation on data migration best practices in SAP to ensure that all steps are being followed correctly.
  
  By following these steps, you should be able to resolve the error and successfully generate the migration object needed for your data migration simulation.