How To Fix CNV_NCE_BAS168 - Number &1: mapping is not unique

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_NCE_BAS - Number conversion engine: messages

• Message number: 168

• Message text: Number &1: mapping is not unique

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_NCE_BAS168 - Number &1: mapping is not unique ?

  The SAP error message CNV_NCE_BAS168, which states "Number &1: mapping is not unique," typically occurs during data migration or conversion processes, particularly when using SAP's data migration tools like the SAP S/4HANA Migration Cockpit or other conversion tools. This error indicates that there are multiple entries in the mapping table for a specific key or identifier, which leads to ambiguity in the data mapping process.
  Cause:
  
  Duplicate Entries: The most common cause of this error is that there are duplicate entries in the mapping table for the specified number (e.g., a material number, customer number, etc.). This means that the system cannot determine which entry to use for the mapping.
  Incorrect Mapping Configuration: The mapping configuration may not be set up correctly, leading to multiple mappings for the same source value.
  Data Quality Issues: There may be issues with the source data, such as inconsistencies or duplicates that were not addressed before the migration.
  
  Solution:
  
  Check Mapping Table: Review the mapping table for the specific number mentioned in the error message. Look for duplicate entries and resolve them by ensuring that each source value maps to a unique target value.
  Data Cleansing: Perform data cleansing on the source data to eliminate duplicates or inconsistencies. This may involve deduplication processes or correcting erroneous data entries.
  Adjust Mapping Configuration: If the mapping configuration is incorrect, adjust it to ensure that each source value has a unique mapping. This may involve modifying the mapping rules or logic used in the migration process.
  Consult Documentation: Refer to the SAP documentation for the specific migration tool you are using. There may be guidelines or best practices for setting up mappings that can help avoid this error.
  Testing: After making changes, conduct tests to ensure that the mapping works correctly and that the error does not reoccur.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to the specific migration tool you are using. There may be known issues or patches that address this error.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  Data Migration Best Practices: Familiarize yourself with best practices for data migration in SAP, which can help prevent issues like this in future projects.
  
  By addressing the root cause of the error and ensuring that your mapping is unique and correctly configured, you should be able to resolve the CNV_NCE_BAS168 error.