How To Fix CNV_10100259 - Duplicate set record expected for set key &1 &2 &3; old sub class &4

CNV_10100259 - Overview

• Message type: E = Error

• Message class: CNV_10100 - Messages from package 10100

• Message number: 259

• Message text: Duplicate set record expected for set key &1 &2 &3; old sub class &4

What causes this issue?

Set records are part of the data conversion and adapted in key field
SUBCLASS. The system verifies the data conversion of set records and
determines possible duplicate records. To prevent duplicate records, the
key field SETNAME must be converted by the set name mapping table. The
set record key displayed is the key after conversion and does already
exist.

System Response

The system can not proceed without a unique set key for all set records
after conversion.

How to fix this error?

Adapt the set name mapping table for the mentioned set names. See
following messages for more details about the participating mapping
records.

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.

CNV_10100259 - Details

• The SAP error message CNV_10100259 indicates that there is a duplicate set record for a specific set key in the system. This error typically arises during data migration or conversion processes, particularly when using SAP's data migration tools or during the execution of conversion programs.
  
  Cause:
  The error occurs when the system encounters a record that is expected to be unique but finds another record with the same key. The key components are usually represented by the placeholders &1, &2, &3, and the old subclass is represented by &4. This suggests that the data being processed has multiple entries that should be unique according to the defined business rules or data model.
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Identify Duplicate Records:
  
  Use the key information provided in the error message to identify the duplicate records in the database. You can run a query on the relevant table to find records with the