How To Fix CNV_DMC_MC071 - Keyfield &1 must be at the top

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_MC - Migration Object Modeler

• Message number: 071

• Message text: Keyfield &1 must be at the top

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_MC071 - Keyfield &1 must be at the top ?

  The SAP error message CNV_DMC_MC071 with the description "Keyfield &1 must be at the top" typically occurs during data migration processes, particularly when using the SAP Data Migration Cockpit (DMC) or similar tools. This error indicates that a key field, which is essential for the data structure, is not positioned correctly in the data file or mapping configuration.
  Cause:
  The error is caused by the requirement that key fields must be listed at the top of the data structure or mapping configuration. This is a common requirement in many data processing systems to ensure that the key fields are processed first, allowing for proper identification and linking of records.
  Solution:
  To resolve this error, you should:
  
  
  Check the Data Structure: Review the data structure or mapping configuration you are using for the migration. Ensure that the key field specified in the error message is positioned at the top of the list.
  
  
  Rearrange Fields: If the key field is not at the top, rearrange the fields in your data file or mapping configuration so that the key field is the first one listed.
  
  
  Validate the Data: After making the changes, validate the data structure to ensure that it meets all requirements for the migration process.
  
  
  Test the Migration: Run a test migration with the corrected data structure to confirm that the error has been resolved.
  
  
  Related Information:
  
  Key Fields: Key fields are critical for uniquely identifying records in a database. They are often used in primary key constraints and are essential for maintaining data integrity during migration.
  SAP Data Migration Cockpit (DMC): This tool is used for migrating data into SAP systems. It provides a user-friendly interface for mapping and transforming data from legacy systems to SAP.
  Documentation: Refer to the official SAP documentation for the Data Migration Cockpit for detailed guidelines on data structure requirements and best practices for data migration.
  
  If you continue to experience issues after following these steps, consider consulting with your SAP support team or checking SAP community forums for additional insights and solutions.