How To Fix CNV_20800186 - Duplicate entries for Old value : &1, New value: &2

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20800 - Message class for CNV_20800

• Message number: 186

• Message text: Duplicate entries for Old value : &1, New value: &2

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_20800186 - Duplicate entries for Old value : &1, New value: &2 ?

  The SAP error message CNV_20800186 indicates that there are duplicate entries in a data conversion or migration process. Specifically, it points to a situation where the system has encountered multiple records with the same "Old value" and "New value" during a data transformation or mapping operation.
  Cause:
  The error typically arises in scenarios such as:
  
  Data migration projects where data from legacy systems is being transformed and loaded into SAP.
  Duplicate records in the source data that are being processed.
  Incorrect mapping configurations that lead to the same old value being mapped to the same new value multiple times.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Identify Duplicate Entries:
  
  Review the source data to identify where the duplicates are occurring. You can use SQL queries or data analysis tools to find records with the same old and new values.
  
  
  
  Data Cleansing:
  
  Clean the source data to remove or consolidate duplicate entries. This may involve deciding which record to keep or merging data from duplicates into a single entry.
  
  
  
  Adjust Mapping Configuration:
  
  If the duplicates are a result of incorrect mapping, review the mapping rules and ensure that each old value is mapped to a unique new value.
  
  
  
  Test the Migration Process:
  
  After making the necessary adjustments, re-run the migration or conversion process in a test environment to ensure that the error no longer occurs.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific data migration tool or process you are using (e.g., SAP S/4HANA Migration Cockpit, LSMW, etc.) for additional guidance.
  
  
  
  Seek Support:
  
  If the issue persists, consider reaching out to SAP support or consulting with a professional who specializes in SAP data migration.
  
  
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may be using transaction codes like LSMW, S/4HANA Migration Cockpit, or others related to data migration.
  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 to avoid similar issues in the future.
  
  By following these steps, you should be able to resolve the CNV_20800186 error and successfully complete your data migration or conversion process.