How To Fix CNV_10020638 - &1 &2: Proxy &3 in source field undefined

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_10020 - Message class for package 10020

• Message number: 638

• Message text: &1 &2: Proxy &3 in source field undefined

What causes this issue?

The source field contains a proxy &V3& that is undefined.

How to fix this error?

Define the proxy &V3& and its value using transaction CNV_10020_PROXYF.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_10020638 - &1 &2: Proxy &3 in source field undefined ?

  The SAP error message CNV_10020638 typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that a proxy (or mapping) for a specific source field is not defined, which means that the system cannot find a corresponding target field for the data being processed.
  Cause:
  
  Missing Mapping: The most common cause is that the mapping between the source and target fields has not been defined correctly in the migration or conversion project.
  Incorrect Configuration: There may be an issue with the configuration of the migration object, where the source field is not properly linked to a target field.
  Data Structure Changes: If there have been changes in the data structure (e.g., during an upgrade or system conversion), the expected fields may no longer exist or may have been renamed.
  
  Solution:
  
  
  Check Mapping Configuration:
  
  Go to the migration project or the relevant configuration area in the SAP system.
  Verify that the source field mentioned in the error message is correctly mapped to a target field.
  If the mapping is missing, create or adjust the mapping to ensure that the source field has a corresponding target field.
  
  
  
  Review Migration Object:
  
  Check the migration object settings to ensure that all required fields are included and correctly defined.
  If necessary, consult the documentation for the specific migration object to understand the expected fields and their mappings.
  
  
  
  Data Validation:
  
  Validate the data being migrated to ensure that it conforms to the expected structure and that all required fields are populated.
  If the source data is incomplete or incorrectly formatted, it may lead to this error.
  
  
  
  Consult SAP Notes:
  
  Look for relevant SAP Notes or Knowledge Base Articles (KBAs) that may address this specific error. SAP frequently updates its documentation and provides solutions for common issues.
  
  
  
  Testing:
  
  After making changes, perform a test migration to ensure that the error is resolved and that data is being processed correctly.
  
  
  
  Related Information:
  
  SAP Migration Cockpit: This tool is used for migrating data to SAP S/4HANA and includes various migration objects that define how data should be transferred.
  Error Logs: Check the error logs for additional details that may provide more context about the error.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  
  If the issue persists after following these steps, it may be beneficial to reach out to SAP support for further assistance.