How To Fix CNV_20800142 - Mapping not maintained for old customer number : &1

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20800 - Message class for CNV_20800

• Message number: 142

• Message text: Mapping not maintained for old customer number : &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_20800142 - Mapping not maintained for old customer number : &1 ?

  The SAP error message CNV_20800142 indicates that there is a mapping issue related to an old customer number in the context of a data migration or conversion process. This error typically arises during the execution of a data migration project, particularly when using SAP's Customer Migration tools or similar functionalities.
  Cause:
  The error occurs when the system encounters an old customer number for which there is no corresponding mapping defined in the migration or conversion settings. This can happen for several reasons:
  
  Missing Mapping Entries: The mapping table that links old customer numbers to new customer numbers does not contain an entry for the specified old customer number.
  Data Inconsistencies: There may be inconsistencies in the data being migrated, such as missing or incorrectly formatted customer numbers.
  Configuration Issues: The migration configuration may not have been set up correctly, leading to missing mappings.
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check Mapping Table:
  
  Verify the mapping table used for the migration process. Ensure that there is an entry for the old customer number indicated in the error message.
  If the entry is missing, you will need to create a mapping for that old customer number to the corresponding new customer number.
  
  
  
  Update Migration Configuration:
  
  Review the migration configuration settings to ensure that all necessary mappings are included.
  If you are using a specific migration tool or program, check its documentation for guidance on how to maintain the mapping.
  
  
  
  Data Validation:
  
  Validate the data being migrated to ensure that all customer numbers are correctly formatted and exist in the source system.
  If there are discrepancies, correct them in the source data before attempting the migration again.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific migration tool you are using. There may be specific instructions or known issues related to the error message.
  
  
  
  Engage SAP Support:
  
  If the issue persists after checking the mapping and configuration, consider reaching out to SAP support for further assistance. They may provide insights specific to your system configuration or the migration process.
  
  
  
  Related Information:
  
  Transaction Codes: Depending on the migration tool you are using, you may need to use specific transaction codes to access the mapping tables or migration settings (e.g., LTMC for Legacy Transfer Migration Cockpit).
  SAP Notes: Search for relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Migration Tools: Familiarize yourself with the migration tools available in SAP, such as the SAP S/4HANA Migration Cockpit, which may have specific requirements for mapping customer numbers.
  
  By following these steps, you should be able to identify and resolve the cause of the CNV_20800142 error message.