How To Fix CNV_DMC_MC_EXCEPTION026 - A field rule with this name already exists at migration object level

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 026

• Message text: A field rule with this name already exists at migration object level

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.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DMC_MC_EXCEPTION026 - A field rule with this name already exists at migration object level ?

  The SAP error message CNV_DMC_MC_EXCEPTION026 indicates that there is a conflict due to a field rule that already exists at the migration object level during a data migration process using the SAP Data Migration Cockpit (DMC). This typically occurs when you are trying to create or modify a field rule that has the same name as an existing one.
  Cause:
  
  Duplicate Field Rule: The most common cause of this error is that you are attempting to create a new field rule with a name that is already in use within the same migration object.
  Configuration Issues: There may be issues in the configuration of the migration object or the data migration project that lead to this conflict.
  Multiple Migration Projects: If you are working with multiple migration projects, there might be overlapping field rule names.
  
  Solution:
  
  Check Existing Field Rules: Review the existing field rules in the migration object to identify if a rule with the same name already exists. You can do this by navigating to the relevant migration object in the DMC.
  Rename the New Field Rule: If you find that a field rule with the same name exists, consider renaming the new field rule to avoid the conflict.
  Delete or Modify Existing Rule: If the existing field rule is not needed, you can delete it or modify it to resolve the conflict.
  Consult Documentation: Refer to the SAP documentation for the Data Migration Cockpit for guidelines on naming conventions and best practices for field rules.
  Check for Migration Object Configuration: Ensure that the migration object is correctly configured and that there are no unintended duplications in the setup.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered and resolved similar issues.
  Data Migration Cockpit Documentation: Review the official SAP documentation for the Data Migration Cockpit for detailed information on field rules and migration object management.
  
  By following these steps, you should be able to resolve the CNV_DMC_MC_EXCEPTION026 error and proceed with your data migration process.