How To Fix CNV_DMC_MC_EXCEPTION095 - The selection field must be a key field

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_MC_EXCEPTION - Exception texts of Migration Object Modeller

• Message number: 095

• Message text: The selection field must be a key field

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DMC_MC_EXCEPTION095 - The selection field must be a key field ?

  The SAP error message CNV_DMC_MC_EXCEPTION095 with the description "The selection field must be a key field" typically occurs in the context of data migration or data conversion processes, particularly when using the SAP Data Migration Cockpit (DMC) or similar tools. This error indicates that a selection field used in a data migration scenario is not defined as a key field in the relevant data structure.
  Cause:
  
  Non-Key Field Usage: The error arises when a field that is not defined as a key field in the database table or structure is being used in a selection criteria for data migration. Key fields are essential for uniquely identifying records in a database table.
  Incorrect Mapping: During the mapping of source fields to target fields, a non-key field may have been incorrectly selected as a key field.
  Configuration Issues: There may be issues in the configuration of the migration project, where the selection criteria do not align with the expected key fields of the target structure.
  
  Solution:
  
  Review Selection Fields: Check the selection fields defined in your data migration project. Ensure that all selection fields are key fields in the target data structure.
  Adjust Mapping: If a non-key field is being used, adjust the mapping to use the appropriate key fields instead. This may involve modifying the data mapping configuration in the DMC.
  Consult Data Dictionary: Use transaction codes like SE11 or SE12 to review the data dictionary for the target table and confirm which fields are defined as key fields.
  Update Migration Template: If you are using a migration template, ensure that it is correctly set up to include only key fields in the selection criteria.
  Testing: After making the necessary adjustments, test the migration process again to ensure that the error is resolved.
  
  Related Information:
  
  Key Fields: Key fields are essential for uniquely identifying records in a database. In SAP, these are typically defined in the data dictionary and are crucial for data integrity.
  Data Migration Cockpit (DMC): This is a tool provided by SAP to facilitate the migration of data from legacy systems to SAP systems. It includes features for mapping, validation, and execution of data migration tasks.
  Error Handling: When encountering errors during data migration, it is important to log the errors and review the migration logs for additional context on the issue.
  
  If the problem persists after following these steps, consider reaching out to SAP support or consulting the SAP community for further assistance.