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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_NCE_BAS111 - NR mapping values for &1 and &2 could result in duplicates ?

  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 addressed prior to the migration.
  
  
  Solution:
  
  
  Review Mapping Configuration: Check the mapping configuration for the fields in question. Ensure that the mapping logic is correctly defined and that it does not lead to duplicate values in the target system.
  
  
  Data Cleansing: Before migration, perform data cleansing on the source data to eliminate duplicates. This may involve:
  
  Identifying and removing duplicate records.
  Consolidating records that should be merged.
  Ensuring that the data adheres to the expected format and uniqueness constraints.
  
  
  
  Adjust Mapping Logic: If necessary, adjust the mapping logic to ensure that it can handle the source data appropriately. This may involve creating unique identifiers or using different mapping strategies.
  
  
  Testing: After making changes, conduct thorough testing to ensure that the migration process works as expected without generating duplicates.
  
  
  Consult Documentation: Refer to SAP documentation or guides related to the specific migration tool you are using for additional insights and best practices.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on handling mapping issues.
  Data Migration Best Practices: Familiarize yourself with best practices for data migration in SAP, which often include steps for data profiling, cleansing, and validation.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By addressing the root cause of the error and ensuring that your mapping logic is sound, you can resolve the CNV_NCE_BAS111 error and proceed with your data migration successfully.