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

CNV_10020639 - Overview

• 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.

CNV_10020639 - Details

• 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