How To Fix CNV_DMC_MC064 - We recommend placing key fields at the top of the table

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_MC - Migration Object Modeler

• Message number: 064

• Message text: We recommend placing key fields at the top of the table

We recommend placing key fields at the top of the table.
This is particularly important if you are working with staging tables.
If key fields are not defined at the top of the table, it might not be
possible to create a staging table for the source structure.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DMC_MC064 - We recommend placing key fields at the top of the table ?

  The SAP error message CNV_DMC_MC064, which states "We recommend placing key fields at the top of the table," typically arises during data migration or data conversion processes, particularly when using the SAP Data Migration Cockpit (DMC) or similar tools. This message is a recommendation rather than a critical error, but it indicates that the structure of the data table could be optimized for better performance and clarity.
  Cause:
  The message is triggered when the data structure (table) being used for migration does not have its key fields positioned at the top. Key fields are essential for identifying records uniquely, and having them at the top of the table can improve readability and processing efficiency.
  Solution:
  To resolve this issue, you should rearrange the fields in your data table so that the key fields are placed at the top. Here are the steps to do this:
  
  
  Identify Key Fields: Determine which fields in your data table are considered key fields. These are typically fields that uniquely identify a record, such as IDs or primary keys.
  
  
  Rearrange the Table Structure: Modify the structure of your data table to place the key fields at the top. This can usually be done in the data preparation phase before loading the data into the SAP system.
  
  
  Validate the Changes: After rearranging the fields, validate the data structure to ensure that it meets the requirements of the SAP Data Migration Cockpit or the specific migration tool you are using.
  
  
  Test the Migration: Run a test migration with the updated table structure to ensure that the error message no longer appears and that the data is processed correctly.
  
  
  Related Information:
  
  Best Practices: It is generally a best practice in data management to have key fields at the top of any data structure for clarity and efficiency. This can help in debugging and understanding the data layout.
  Documentation: Refer to SAP documentation related to data migration and the specific tools you are using for additional guidelines and recommendations.
  Performance Considerations: While this message is a recommendation, following it can lead to improved performance during data processing, especially with large datasets.
  
  By following these steps, you should be able to address the CNV_DMC_MC064 message effectively.