How To Fix CNV_20800187 - All customer numbers present in KNA1 are assigned in mapping

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20800 - Message class for CNV_20800

• Message number: 187

• Message text: All customer numbers present in KNA1 are assigned in mapping

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_20800187 - All customer numbers present in KNA1 are assigned in mapping ?

  The SAP error message CNV_20800187 indicates that all customer numbers present in the KNA1 table (which contains general data for customers) are already assigned in the mapping during a data migration or conversion process. This typically occurs in the context of using SAP's data migration tools, such as the SAP S/4HANA Migration Cockpit or other data transfer tools.
  Cause:
  
  Duplicate Customer Numbers: The error may arise if the customer numbers in the source system are duplicated or if they have already been mapped to another entity in the target system.
  Mapping Table Issues: The mapping table that is supposed to link source customer numbers to target customer numbers may not have the correct entries or may be fully populated.
  Data Integrity Issues: There may be issues with the integrity of the data being migrated, such as missing or incorrect entries in the mapping table.
  
  Solution:
  
  Check Mapping Table: Review the mapping table to ensure that it contains the correct mappings for all customer numbers. If there are duplicates or missing entries, correct them.
  Identify Duplicates: Use SQL queries or data analysis tools to identify any duplicate customer numbers in the KNA1 table. Resolve any duplicates by either merging records or assigning unique identifiers.
  Adjust Migration Settings: If applicable, adjust the settings in the migration tool to allow for the handling of existing customer numbers, or to skip already mapped entries if that is acceptable for your migration strategy.
  Data Cleansing: Perform data cleansing on the source data to ensure that all customer numbers are unique and correctly formatted before attempting the migration again.
  Consult Documentation: Refer to the SAP documentation for the specific migration tool you are using for any additional troubleshooting steps or configuration options that may help resolve the issue.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on handling customer number mappings.
  Migration Cockpit: Familiarize yourself with the SAP S/4HANA Migration Cockpit and its functionalities, as it may provide additional tools for managing data mappings and resolving conflicts.
  Data Migration Best Practices: Review best practices for data migration in SAP environments to ensure a smooth transition and minimize errors.
  
  If the issue persists after following these steps, consider reaching out to SAP support or consulting with an SAP expert who specializes in data migration.