How To Fix CNV_NCE_BAS111 - NR mapping values for &1 and &2 could result in duplicates

CNV_NCE_BAS111 - Overview

• Message type: E = Error

• Message class: CNV_NCE_BAS - Number conversion engine: messages

• Message number: 111

• Message text: NR mapping values for &1 and &2 could result in duplicates

What causes this issue?

The target external intervals of two mapping values overlap
(alphanumeric values). Since one-to-one mappings exist for at least for
one of them, this overlap could be acceptable and produce no duplicate
numbers. An exact check requires a database analysis which is not
possible at this point in time; it will be done later during the
conversion simulation.

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?

Check the mapping values for conflicting intervals. If possible, ensure
that the overlap does not result in duplicate numbers.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

CNV_NCE_BAS111 - Details

• The SAP error message CNV_NCE_BAS111 indicates that there is a potential issue with mapping values during a data conversion or migration process. Specifically, it suggests that the mapping values for the specified fields (&1 and &2) could lead to duplicate entries in the target system. This is often encountered during data migration projects, especially when using SAP's Conversion Tools or Data Migration tools.
  
  Cause:
  
  
  Duplicate Mapping Values: The most common cause of this error is that the source data contains multiple records that map to the same target value. For example, if two different records in the source system are being mapped to the same value in the target system, this will create a conflict and result in duplicates.
  
  
  Incorrect Mapping Logic: The mapping logic defined in the migration tool may not be correctly set up, leading to unintended duplicates.
  
  
  Data Quality Issues: The source data may have inconsistencies or duplicates that were not