How To Fix CNV_DMC_MM002 - Start not possible. Data Transfer is still running

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_MM - General message class of Migration Monitor

• Message number: 002

• Message text: Start not possible. Data Transfer is still running

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DMC_MM002 - Start not possible. Data Transfer is still running ?

  The SAP error message CNV_DMC_MM002 indicates that a data transfer process is currently running, which prevents the initiation of a new data transfer. This error is typically encountered in the context of SAP Data Migration Cockpit (DMC) or during data migration activities.
  Cause:
  
  Ongoing Data Transfer: The most common cause of this error is that a previous data transfer job has not yet completed. This could be due to long-running processes, system performance issues, or other factors that delay the completion of the data transfer.
  Locking Mechanism: SAP uses locking mechanisms to prevent multiple data transfer processes from running simultaneously, which can lead to data inconsistencies.
  System Configuration: There may be configuration settings that limit the number of concurrent data transfer jobs.
  
  Solution:
  
  
  Check Running Jobs: 
  
  Use transaction codes like SM37 (Job Monitoring) to check for any running background jobs related to data transfer. Look for jobs that are stuck or taking longer than expected.
  If you find a job that is taking too long, you may need to investigate why it is not completing.
  
  
  
  Wait for Completion: If a data transfer job is running, the simplest solution is to wait for it to complete. Monitor the job status to see when it finishes.
  
  
  Terminate Stuck Jobs: If you determine that a job is stuck and not progressing:
  
  You can terminate the job using transaction SM37. Select the job and choose the option to cancel it. Be cautious with this step, as terminating a job may lead to data inconsistencies.
  
  
  
  Check Logs: Review the logs of the data transfer process to identify any errors or issues that may have caused the job to hang.
  
  
  System Performance: If data transfers are frequently taking too long, consider reviewing system performance and resource allocation. You may need to optimize the system or schedule data transfers during off-peak hours.
  
  
  Configuration Review: Check the configuration settings for data transfer jobs to ensure that they are set up correctly and that the system can handle the expected load.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Documentation: Review the SAP Data Migration Cockpit documentation for best practices and guidelines on managing data transfers.
  Support: If the issue persists and you cannot resolve it, consider reaching out to SAP Support for assistance.
  
  By following these steps, you should be able to resolve the CNV_DMC_MM002 error and successfully initiate your data transfer process.