How To Fix CNV_DCII_COMM009 - Old value &1 exists more than once in the mapping

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DCII_COMM - messages of objects of dev class CNV_DCII_COMM

• Message number: 009

• Message text: Old value &1 exists more than once in the mapping

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DCII_COMM009 - Old value &1 exists more than once in the mapping ?

  The SAP error message CNV_DCII_COMM009 indicates that there is a duplicate entry for an old value in the mapping table during a data conversion or migration process. This typically occurs in the context of SAP's Data Conversion or Migration tools, such as the SAP S/4HANA Migration Cockpit or other data transformation tools.
  Cause:
  The error arises when the system detects that the old value (in the mapping) is not unique. This means that the same old value is mapped to multiple new values, which creates ambiguity in the data transformation process. This can happen due to:
  
  Data Duplication: The source data may have duplicate entries for the same old value.
  Incorrect Mapping Configuration: The mapping table may have been incorrectly configured, leading to multiple mappings for the same old value.
  Data Quality Issues: Poor data quality in the source system can lead to duplicates that were not anticipated.
  
  Solution:
  To resolve the CNV_DCII_COMM009 error, you can follow these steps:
  
  
  Identify Duplicates:
  
  Check the mapping table for the old value mentioned in the error message. Look for any duplicate entries for that old value.
  You can use SQL queries or data analysis tools to identify duplicates in the source data.
  
  
  
  Correct the Mapping:
  
  If duplicates exist in the mapping table, you need to decide which mapping is correct and remove or consolidate the duplicates.
  Ensure that each old value maps to a unique new value.
  
  
  
  Clean Source Data:
  
  If the source data contains duplicates, you may need to clean the data before performing the migration. This could involve deduplication processes or data cleansing activities.
  
  
  
  Test the Mapping:
  
  After making the necessary corrections, test the mapping again to ensure that the error is resolved.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation related to the specific migration or conversion tool you are using for any additional guidelines or best practices.
  
  
  
  Seek Support:
  
  If you are unable to resolve the issue, consider reaching out to SAP support or consulting with an SAP expert who can provide further assistance.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  Data Migration Best Practices: Familiarize yourself with best practices for data migration in SAP, which can help prevent similar issues in the future.
  SAP Community: Engage with the SAP Community forums where other users may have encountered and resolved similar issues.
  
  By following these steps, you should be able to resolve the CNV_DCII_COMM009 error and successfully complete your data migration or conversion process.