How To Fix CNV_NCE_BAS112 - 1:1 and NR mapping values for &1 and &2 could produce duplicates (no. &3)

CNV_NCE_BAS112 - Overview

• Message type: E = Error

• Message class: CNV_NCE_BAS - Number conversion engine: messages

• Message number: 112

• Message text: 1:1 and NR mapping values for &1 and &2 could produce duplicates (no. &3)

What causes this issue?

The target alphanumeric value of the one-to-one mapping lies inside the
target external interval of the number range mapping. The mapping values
will result in duplicate values if the same number already exists in the
number range interval. 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. If possible, ensure that the target interval
of the number range mapping does not contain the target value of the
one-to-one mapping.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

CNV_NCE_BAS112 - Details

• The SAP error message CNV_NCE_BAS112 typically occurs during data migration or conversion processes, particularly when using SAP's Data Migration tools or during the execution of a conversion program. This error indicates that there is a potential issue with the mapping of values, specifically that the mapping values for two fields (denoted as &1 and &2) could lead to duplicate entries in the target system.
  
  Cause:
  The error arises when the mapping logic defined for the data conversion results in two or more source records being mapped to the same target record. This can happen due to:
  
  Duplicate Source Records: If the source data contains duplicate entries for the fields being mapped, it can lead to conflicts in the target system.
  Incorrect Mapping Logic: The mapping rules defined in the conversion program may not be unique enough to ensure that each source record maps to a distinct target record.
  Data Quality Issues: Poor data quality in