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

CNV_10020638 - Overview

• 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.

CNV_10020638 - Details

• 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