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

CNV_DMC_MM002 - Overview

• 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

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

CNV_DMC_MM002 - Details

• 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