How To Fix CNV20201420 - Duplicates for &1: target value=&2

CNV20201420 - Overview

• Message type: E = Error

• Message class: CNV20201 -

• Message number: 420

• Message text: Duplicates for &1: target value=&2

What causes this issue?

Duplicates: &V1&
Target object =
&V2&
Source object1 =
&V3&
Source object2 =
&V4&
The conversion logic leads to duplicates (for example for asset numbers
or document numbers). However these objects must remain unique and
cannot be merged.

System Response

Error

How to fix this error?

You need to change the conversion logic so that no duplicates occur.
Having done so, execute the activity 'Number range objects: Simulate
conversion' once again.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

CNV20201420 - Details

• The SAP error message CNV20201420, which indicates "Duplicates for &1: target value=&2," typically arises during data migration or conversion processes, particularly when using SAP's Data Migration tools or during the execution of the SAP S/4HANA Migration Cockpit. This error suggests that there are duplicate entries in the data being processed, which violates the uniqueness constraints defined in the target system.
  
  Cause:
  
  
  Duplicate Data: The primary cause of this error is the presence of duplicate records in the source data that are being migrated to the target system. This could be due to:
  
  Multiple records in the source system that have the same key or identifier.
  Data extraction processes that inadvertently pull in duplicate entries.
  Incorrect data preparation or cleansing prior to migration.
  
  
  
  Unique Constraints: The target system may have unique constraints defined for certain fields (e.g., primary keys, unique indexes) that the incoming data must adhere to. If the data being migrated contains duplicates for these