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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_NCE_BAS112 - 1:1 and NR mapping values for &1 and &2 could produce duplicates (no. &3) ?

  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 the source system, such as missing or inconsistent values, can also lead to this error.
  
  Solution:
  To resolve the CNV_NCE_BAS112 error, you can take the following steps:
  
  
  Review Source Data: Check the source data for duplicates in the fields being mapped. You can use SQL queries or data analysis tools to identify duplicate records.
  
  
  Adjust Mapping Logic: Modify the mapping rules to ensure that each source record maps to a unique target record. This may involve:
  
  Adding additional fields to the mapping criteria to create a composite key.
  Changing the logic to handle duplicates, such as aggregating data or selecting a primary record.
  
  
  
  Data Cleansing: Clean the source data to remove duplicates or inconsistencies. This may involve:
  
  Merging duplicate records.
  Standardizing values to ensure consistency.
  
  
  
  Testing: After making changes, run a test migration to ensure that the error is resolved and that the data is correctly mapped without duplicates.
  
  
  Consult Documentation: Refer to SAP documentation or notes related to the specific migration tool you are using for any additional guidance or best practices.
  
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may need to use transaction codes like LTMC (for Migration Cockpit) or LTMOM (for Migration Object Modeler) to manage your migration projects.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Data Migration Best Practices: Familiarize yourself with best practices for data migration in SAP, including data profiling, cleansing, and validation techniques.
  
  By following these steps, you should be able to identify the root cause of the CNV_NCE_BAS112 error and implement a solution to resolve it.