How To Fix CNV_NCE_BAS159 - NR interval &1: interval cannot be excluded (one-to-one mappings exist)

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_NCE_BAS - Number conversion engine: messages

• Message number: 159

• Message text: NR interval &1: interval cannot be excluded (one-to-one mappings exist)

What causes this issue?

You have chosen the rule 'No Conversion' for the corresponding number
range interval, although one-to-one mapping values exist for the numbers
that belong to it.

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?

Choose the 'One-to-one' rule for the number range interval.

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_BAS159 - NR interval &1: interval cannot be excluded (one-to-one mappings exist) ?

  The SAP error message CNV_NCE_BAS159 typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that there is an issue with the mapping of intervals in the data being processed. Specifically, it suggests that there are one-to-one mappings that prevent the exclusion of a certain interval.
  Cause:
  The error message "interval cannot be excluded (one-to-one mappings exist)" indicates that:
  
  There are existing one-to-one mappings for the specified interval, which means that each entry in the source data corresponds directly to an entry in the target data.
  The system is trying to exclude an interval that is still being referenced by these mappings, which is not allowed.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review Mappings: Check the mappings defined in your migration or conversion project. Ensure that there are no one-to-one mappings that reference the interval you are trying to exclude.
  
  
  Adjust Mappings: If you find that there are indeed one-to-one mappings that reference the interval, you will need to either:
  
  Remove or modify these mappings so that they no longer reference the interval you wish to exclude.
  Change the logic of your migration to accommodate the necessary mappings without excluding the interval.
  
  
  
  Consult Documentation: Refer to the SAP documentation related to the specific migration or conversion tool you are using. There may be specific guidelines or best practices for handling intervals and mappings.
  
  
  Testing: After making adjustments, run a test migration to ensure that the error does not occur again and that the data is being processed as expected.
  
  
  Seek Support: If you are unable to resolve the issue, consider reaching out to SAP support or consulting with an SAP expert who can provide more tailored assistance based on your specific scenario.
  
  
  Related Information:
  
  Migration Cockpit: If you are using the SAP S/4HANA Migration Cockpit, familiarize yourself with its features and limitations regarding data mapping and intervals.
  Data Mapping Guidelines: Review best practices for data mapping in SAP migrations, as improper mappings can lead to various errors.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional context or solutions.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.