How To Fix CNVMBT028 - Expert mode not allowed, program must succeed once

SAP Error Message - Details

• Message type: E = Error

• Message class: CNVMBT - Messages for MBT/API/PCL

• Message number: 028

• Message text: Expert mode not allowed, program must succeed once

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNVMBT028 - Expert mode not allowed, program must succeed once ?

  The SAP error message CNVMBT028 indicates that the program is running in a mode that does not allow for expert mode operations, and it requires that the program must succeed at least once before proceeding. This error typically arises in the context of data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools.
  Cause:
  
  Expert Mode Not Enabled: The program is being executed in a standard mode where expert features are not permitted. This can happen if the user does not have the necessary authorizations or if the configuration does not allow for expert mode operations.
  Initial Execution Requirement: The program is designed to require a successful run in a non-expert mode before it can be executed in expert mode. This is often a safeguard to ensure that the initial data load is successful before allowing more complex operations.
  
  Solution:
  
  Run in Standard Mode: First, ensure that you run the program in the standard mode without enabling expert features. This will allow the program to complete its initial run successfully.
  Check Authorizations: Verify that the user executing the program has the necessary authorizations to run the program in expert mode. If not, you may need to adjust user roles or permissions.
  Review Configuration: Check the configuration settings of the migration tool or program to ensure that it is set up correctly to allow for expert mode operations after a successful initial run.
  Consult Documentation: Refer to the official SAP documentation for the specific migration tool you are using. There may be specific steps or prerequisites that need to be followed.
  Error Logs: Review any error logs or messages that may provide additional context on why the program is failing to run in expert mode.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error message or provide additional troubleshooting steps.
  Migration Cockpit Documentation: Review the documentation for the SAP S/4HANA Migration Cockpit or the specific data migration tool you are using for detailed instructions on running programs in different modes.
  Community Forums: Consider searching or posting in SAP community forums or support channels for insights from other users who may have encountered the same issue.
  
  By following these steps, you should be able to resolve the CNVMBT028 error and successfully run your migration or conversion program.