How To Fix CNV_DMC_MC058 - Field name '&' not unique

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_MC - Migration Object Modeler

• Message number: 058

• Message text: Field name '&' not unique

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_MC058 - Field name '&' not unique ?

  The SAP error message CNV_DMC_MC058, which states "Field name '&' not unique," typically occurs during data migration or conversion processes, particularly when using the SAP Data Migration Cockpit (DMC) or similar tools. This error indicates that there is a conflict with field names in the data being processed, where the system has encountered multiple fields with the same name, leading to ambiguity.
  Cause:
  
  Duplicate Field Names: The most common cause of this error is that the data source contains multiple fields with the same name. This can happen if the source system has been poorly designed or if there are multiple tables or structures that have overlapping field names.
  Mapping Issues: During the mapping process, if the same field is mapped to multiple target fields or if there are inconsistencies in the mapping definitions, this error can arise.
  Configuration Errors: Incorrect configuration in the migration settings or templates can lead to this issue, especially if the field names are not properly defined or if there are typos.
  
  Solution:
  
  Identify Duplicate Fields: Review the data source to identify any duplicate field names. This can often be done by examining the source tables or structures involved in the migration.
  Rename Fields: If possible, rename the duplicate fields in the source data to ensure that each field has a unique name. This may involve modifying the source data or adjusting the extraction process.
  Adjust Mapping: Check the mapping configuration in the migration tool. Ensure that each field is mapped correctly and that there are no overlaps or conflicts in the mapping definitions.
  Review Configuration: Go through the migration configuration settings to ensure that everything is set up correctly. Look for any settings that might be causing the duplication issue.
  Consult Documentation: Refer to SAP documentation or notes related to the specific migration tool you are using for any additional guidance or troubleshooting steps.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional context on how to resolve it.
  Data Migration Cockpit Documentation: Review the official SAP documentation for the Data Migration Cockpit, which may provide insights into common issues and best practices for data migration.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to resolve the CNV_DMC_MC058 error and proceed with your data migration successfully.