How To Fix CNV_NCE_BAS428 - Duplicate one-to-one mapping values found

CNV_NCE_BAS428 - Overview

• Message type: E = Error

• Message class: CNV_NCE_BAS - Number conversion engine: messages

• Message number: 428

• Message text: Duplicate one-to-one mapping values found

What causes this issue?

Duplicate mapping values found for 1:1 mapping values. The number range
interval is defined by OBJECT = &V1& / SUBOBJECT = &V2& / NRRANGENR =
&V3& / TOYEAR = &V4&.

System Response

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

How to fix this error?

Return to the <ZK>1:1 Number Mapping Values</> tab page, and enter the
required data.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

CNV_NCE_BAS428 - Details

• The SAP error message CNV_NCE_BAS428: Duplicate one-to-one mapping values found 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 are duplicate entries in the mapping table that are supposed to have unique one-to-one relationships.
  
  Cause:
  
  Duplicate Entries: The most common cause of this error is that the mapping table contains duplicate values for a field that is expected to have unique entries. For example, if you are mapping customer IDs, and the same customer ID appears more than once in the mapping table, this will trigger the error.
  Incorrect Data Preparation: The data preparation phase may not have been executed correctly, leading to duplicates being introduced into the mapping data.
  
  Configuration Issues: There may be issues with the configuration of the migration project or the mapping settings that allow duplicates to be created.
  
  
  Solution:
  
  Identify Duplicates: Review the mapping