How To Fix CNV_00001258 - No target field is mapped by multiple field mappings of source table &1

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_00001 - Message class for CWB settings maintenance programs

• Message number: 258

• Message text: No target field is mapped by multiple field mappings of source table &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_00001258 - No target field is mapped by multiple field mappings of source table &1 ?

  The SAP error message CNV_00001258 indicates that there is an issue with the mapping of fields during a data migration or conversion process. Specifically, it means that a target field in the target table is being mapped by multiple source fields from the source table, which is not allowed.
  Cause:
  This error typically arises in the context of data migration projects, especially when using tools like SAP's Data Migration Cockpit or other conversion tools. The root causes can include:
  
  Duplicate Mappings: Multiple source fields are incorrectly mapped to the same target field, leading to ambiguity about which source field's data should populate the target field.
  Configuration Errors: Errors in the configuration of the mapping settings, where the same target field is unintentionally assigned to multiple source fields.
  Data Model Changes: Changes in the data model that have not been reflected in the mapping configuration, leading to inconsistencies.
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Review Field Mappings: Check the mapping configuration for the specific source table mentioned in the error message. Ensure that each target field is mapped to only one source field.
  
  
  Identify Duplicates: Look for any duplicate entries in the mapping configuration. If you find that multiple source fields are mapped to the same target field, decide which source field should be used and remove the others.
  
  
  Adjust Mapping Logic: If the business logic requires that multiple source fields contribute to a single target field, consider implementing a transformation or aggregation logic that combines the values from the source fields before mapping them to the target field.
  
  
  Test the Changes: After making adjustments, run the migration or conversion process again to ensure that the error is resolved.
  
  
  Documentation: Document the changes made to the mapping configuration for future reference and to avoid similar issues.
  
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like LTMC (for the Migration Cockpit) or LTMOM (for the Migration Object Modeler) to access and modify the mapping configurations.
  SAP Notes: Check for any relevant SAP Notes that might provide additional insights or solutions related to this error message.
  Data Migration Best Practices: Familiarize yourself with best practices for data migration in SAP, including proper mapping strategies and validation techniques to ensure data integrity.
  
  By following these steps, you should be able to resolve the CNV_00001258 error and successfully complete your data migration or conversion process.