How To Fix CNV_10020639 - &1 &2: Proxy &3 in proxy &4 in source field undefined

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_10020 - Message class for package 10020

• Message number: 639

• Message text: &1 &2: Proxy &3 in proxy &4 in source field undefined

What causes this issue?

The source field contains a proxy &V4& that refers to another 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_10020639 - &1 &2: Proxy &3 in proxy &4 in source field undefined ?

  The SAP error message CNV_10020639 typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. This error indicates that there is an issue with a proxy object in the data being processed, specifically that a source field is undefined.
  Cause:
  The error message can arise due to several reasons:
  
  Missing or Incorrect Mapping: The source field in the data mapping configuration may not be correctly defined or may be missing entirely.
  Data Structure Changes: If there have been changes in the data structure (e.g., fields added or removed) in the source system, the migration tool may not be able to find the expected fields.
  Inconsistent Data: The data being migrated may contain inconsistencies or errors that prevent the tool from processing it correctly.
  Configuration Issues: There may be issues in the configuration of the migration cockpit or the specific migration object being used.
  
  Solution:
  To resolve the error, you can take the following steps:
  
  Check Mapping Configuration: Review the mapping configuration in the migration cockpit to ensure that all required fields are correctly mapped and defined.
  Validate Source Data: Check the source data for any inconsistencies or missing values that could lead to undefined fields. Ensure that the data adheres to the expected structure.
  Review Migration Object: Ensure that the migration object you are using is correctly configured and that all necessary fields are included.
  Consult Documentation: Refer to the SAP documentation for the specific migration tool you are using to understand the expected data structure and mapping requirements.
  Debugging: If you have access to debugging tools, you can trace the execution to identify where the error is occurring and gather more context about the undefined field.
  SAP Notes: Check for any relevant SAP Notes or updates that may address this specific error or provide additional guidance.
  
  Related Information:
  
  SAP Migration Cockpit: This is a tool used for data migration to SAP S/4HANA, and understanding its configuration and usage is crucial for successful data migration.
  Data Mapping: Proper data mapping is essential for ensuring that data from the source system aligns with the target system's structure.
  SAP Community: Engaging with the SAP Community can provide insights from other users who may have encountered similar issues.
  
  If the problem persists after following these steps, consider reaching out to SAP support for further assistance, providing them with detailed information about the error and the context in which it occurred.