How To Fix CNV_20900194 - Duplicate entries found for Old value : &1, New value: &2

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20900 - Message class for package CNV_20900

• Message number: 194

• Message text: Duplicate entries found 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_20900194 - Duplicate entries found for Old value : &1, New value: &2 ?

  The SAP error message CNV_20900194 indicates that there are duplicate entries found during a data migration or conversion process. This error typically arises when the system encounters multiple records that have the same "Old value" while trying to map or convert them to a "New value." This can happen in various scenarios, such as during data migration from legacy systems to SAP or when performing data transformations.
  Cause:
  
  Duplicate Data: The most common cause is that the source data contains duplicate entries for the specified values. For example, if you are migrating customer records, there may be multiple records with the same customer ID or name.
  Mapping Issues: There may be issues in the mapping logic where multiple old values are being mapped to the same new value, leading to conflicts.
  Data Quality Issues: Poor data quality in the source system can lead to duplicates, such as missing unique identifiers or inconsistent data entry practices.
  
  Solution:
  
  
  Identify Duplicates: 
  
  Review the source data to identify the duplicate entries for the specified old value. You can use SQL queries or data analysis tools to find duplicates.
  Example SQL query to find duplicates:
  SELECT OldValue, COUNT(*)
  FROM YourSourceTable
  GROUP BY OldValue
  HAVING COUNT(*) > 1;
  
  
  
  
  Data Cleansing:
  
  Clean the source data to remove duplicates. This may involve consolidating records, choosing a primary record, or merging data as appropriate.
  Ensure that each old value has a unique mapping to a new value.
  
  
  
  Adjust Mapping Logic:
  
  If the mapping logic is causing the issue, review and adjust it to ensure that each old value maps to a unique new value.
  Update the transformation rules in your migration tool or program.
  
  
  
  Testing:
  
  After making the necessary changes, re-run the migration or conversion process in a test environment to ensure that the error is resolved.
  
  
  
  Documentation:
  
  Document the changes made to the data and mapping logic for future reference and to prevent similar issues.
  
  
  
  Related Information:
  
  Data Migration Tools: If you are using specific SAP tools for data migration (like SAP S/4HANA Migration Cockpit, LSMW, or others), refer to their documentation for best practices on handling duplicates.
  Data Quality Management: Implement data quality management practices to prevent duplicates in the source data before migration.
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions related to this error message.
  
  By following these steps, you should be able to resolve the CNV_20900194 error and ensure a smoother data migration process.