How To Fix CNV_NCE_BAS110 - 1:1 and NR mapping values for &1 and &2 result in duplicates (number &3)

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_NCE_BAS - Number conversion engine: messages

• Message number: 110

• Message text: 1:1 and NR mapping values for &1 and &2 result in duplicates (number &3)

What causes this issue?

You have specified a one-to-one mapping value for the source number. The
target number is already mapped to the different source number with a
number range interval mapping. These mappings are not acceptable as they
will result in duplicate numbers during the conversion.

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?

Change the target number of the one-to-one mapping or correct mapping
for the conflicting number range interval.
&FURTHER_HINTS&
Information about conflicting number range intervals is generally given
in the following form:
<source subobject value>/<source number range number>/<(>
<<)>source to-year>.
Since temporary number intervals could exist without the corresponding
number range numbers (they are built from the values that do not belong
to any number range interval), the information about them comes in the
form:
<source subobject value>/<first number of the source number
interval>/<source to-year>.
Information about the one-to-one mapping is given in the form:
<source subobject value>/<source number>/<source
fiscal year>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_NCE_BAS110 - 1:1 and NR mapping values for &1 and &2 result in duplicates (number &3) ?

  The SAP error message CNV_NCE_BAS110 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 specific error indicates that there are duplicate mapping values for the specified fields, which can lead to inconsistencies in the data being processed.
  Cause:
  The error message "1:1 and NR mapping values for &1 and &2 result in duplicates (number &3)" suggests that:
  
  There are two fields (denoted as &1 and &2) that are expected to have a one-to-one (1:1) mapping, but the data being processed has multiple entries for the same value.
  The "number &3" indicates how many duplicates were found for the mapping values.
  
  This situation can arise due to:
  
  Incorrect or incomplete data in the source system.
  Misconfiguration in the mapping settings.
  Data integrity issues where the same key is being used for multiple records.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Identify Duplicates:
  
  Analyze the source data to identify the duplicate values for the fields mentioned in the error message. You can use SQL queries or data analysis tools to find duplicates.
  
  
  
  Data Cleansing:
  
  Clean the source data to ensure that each value in the mapping fields is unique. This may involve:
  
  Merging records.
  Removing duplicates.
  Correcting data entries.
  
  
  
  
  
  Review Mapping Configuration:
  
  Check the mapping configuration in the migration tool to ensure that it is set up correctly. Ensure that the fields are intended to have a one-to-one relationship.
  
  
  
  Adjust Mapping Logic:
  
  If the business logic allows, consider adjusting the mapping to accommodate the duplicates. This could involve changing the mapping from 1:1 to a different relationship if appropriate.
  
  
  
  Testing:
  
  After making the necessary changes, re-run the migration or conversion process to verify that the error has been resolved.
  
  
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like SE11 (Data Dictionary), SE80 (Object Navigator), or SE37 (Function Module) to analyze the data structures and mappings.
  SAP Notes: Check SAP Notes for any known issues or patches related to the CNV_NCE_BAS110 error.
  Documentation: Review the documentation for the specific data migration tool you are using, as it may provide additional insights into handling mapping issues.
  
  By following these steps, you should be able to resolve the CNV_NCE_BAS110 error and ensure a successful data migration process.