How To Fix CNV_DMC_MC_EXCEPTION102 - Data element &1 already added

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 102

• Message text: Data element &1 already added

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_EXCEPTION102 - Data element &1 already added ?

  The SAP error message CNV_DMC_MC_EXCEPTION102 with the description "Data element &1 already added" 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 an attempt to add a data element that has already been included in the migration project or mapping.
  Cause:
  
  Duplicate Data Element: The most common cause of this error is that the data element specified (represented by &1) has already been added to the mapping or transformation logic in the migration project.
  Incorrect Mapping Configuration: There may be a misconfiguration in the mapping settings where the same data element is being referenced multiple times.
  Data Model Issues: The underlying data model may have inconsistencies or duplications that lead to this error.
  
  Solution:
  
  Check Mapping Configuration: Review the mapping configuration in the Data Migration Cockpit. Ensure that the data element in question is not being added multiple times. If it is, remove the duplicate entry.
  Review Data Model: Examine the data model to ensure that there are no duplicate definitions or references to the same data element. If duplicates exist, resolve them by consolidating or removing unnecessary entries.
  Clear Cache: Sometimes, clearing the cache or refreshing the project can help resolve temporary issues that may lead to this error.
  Consult Documentation: Refer to the SAP documentation for the Data Migration Cockpit for any specific guidelines or best practices related to data element mapping.
  Error Logs: Check the error logs for more detailed information about the context in which the error occurred. This can provide insights into what might be causing the duplication.
  Seek Support: If the issue persists, consider reaching out to SAP support or consulting with an SAP expert who can provide more tailored assistance based on your specific scenario.
  
  Related Information:
  
  SAP Data Migration Cockpit (DMC): This tool is used for migrating data from legacy systems to SAP S/4HANA or other SAP systems. Understanding its functionalities and limitations can help in troubleshooting issues.
  Data Mapping: Familiarize yourself with the concepts of data mapping and transformation, as these are critical in ensuring successful data migration.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.