How To Fix CNV_20800038 - No N:1 conversion. No method of duplicate table keys indicators were set

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20800 - Message class for CNV_20800

• Message number: 038

• Message text: No N:1 conversion. No method of duplicate table keys indicators were set

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_20800038 - No N:1 conversion. No method of duplicate table keys indicators were set ?

  The SAP error message CNV_20800038 indicates that there is an issue with the conversion process in the SAP system, specifically related to the handling of duplicate keys in a table during a data migration or conversion scenario. This error typically arises in the context of SAP's data migration tools, such as the SAP S/4HANA Migration Cockpit or other data conversion tools.
  Cause:
  The error message "No N:1 conversion. No method of duplicate table keys indicators were set" suggests that the system encountered a situation where it expected to perform a one-to-many (N:1) conversion, but it could not find a suitable method to handle duplicate keys in the source data. This can happen due to:
  
  Duplicate Entries: The source data contains duplicate entries for a key that should be unique, and the conversion process does not know how to handle these duplicates.
  Configuration Issues: The conversion settings or configuration may not have been properly defined to manage duplicates.
  Data Quality Issues: The data being migrated may not meet the expected quality standards, leading to duplicates that were not anticipated.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Identify Duplicates: Check the source data for duplicate entries based on the key fields. You can use SQL queries or data analysis tools to identify these duplicates.
  
  
  Data Cleansing: Clean the source data to remove or consolidate duplicates. This may involve:
  
  Merging duplicate records.
  Deleting unnecessary duplicates.
  Ensuring that each key is unique before migration.
  
  
  
  Adjust Conversion Settings: If applicable, review the conversion settings in the migration tool. Ensure that there are methods defined for handling duplicates, such as:
  
  Aggregating data.
  Choosing a primary record among duplicates.
  Defining rules for how to handle conflicts.
  
  
  
  Test Migration: After making the necessary adjustments, perform a test migration to ensure that the error does not occur again.
  
  
  Consult Documentation: Refer to the SAP documentation related to the specific migration tool you are using for any additional configuration options or best practices regarding duplicate handling.
  
  
  Seek Support: If the issue persists, consider reaching out to SAP support or consulting with an SAP expert who can provide guidance based on your specific scenario.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Data Migration Best Practices: Familiarize yourself with best practices for data migration in SAP, which often include data profiling, cleansing, and validation steps.
  Migration Cockpit Documentation: Review the official SAP documentation for the Migration Cockpit or the specific tool you are using, as it may contain specific instructions for handling duplicate keys.
  
  By following these steps, you should be able to resolve the CNV_20800038 error and successfully complete your data migration or conversion process.