How To Fix CNV_DCII_COMM004 - Field &1 of table &2 is no key field

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DCII_COMM - messages of objects of dev class CNV_DCII_COMM

• Message number: 004

• Message text: Field &1 of table &2 is no key field

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DCII_COMM004 - Field &1 of table &2 is no key field ?

  The SAP error message CNV_DCII_COMM004 indicates that a specific field in a specified table is not defined as a key field, which is a requirement for certain operations, particularly in the context of data conversion or migration processes.
  Cause:
  This error typically arises during data migration or conversion activities, especially when using tools like SAP's Data Conversion Workbench (DCW) or similar utilities. The error message suggests that the system expects a field to be a key field (i.e., a field that uniquely identifies a record in the table), but the specified field is not defined as such in the database schema.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Table Definition:
  
  Use transaction code SE11 (Data Dictionary) to check the definition of the table mentioned in the error message.
  Verify the fields defined as key fields in the table. If the field you are trying to use is not a key field, you may need to adjust your data mapping or selection criteria.
  
  
  
  Modify Data Mapping:
  
  If you are using a data migration tool, ensure that you are mapping the correct fields. If the field in question is not a key field, you may need to select a different field that is defined as a key.
  
  
  
  Adjust Migration Logic:
  
  If the migration logic requires a key field, consider modifying the logic to include a valid key field. This may involve changing the source data or the transformation rules.
  
  
  
  Consult Documentation:
  
  Review the documentation for the specific migration tool or process you are using. There may be specific requirements or guidelines regarding key fields.
  
  
  
  Seek Help from SAP Support:
  
  If you are unable to resolve the issue, consider reaching out to SAP support or consulting with an SAP expert who can provide guidance based on your specific scenario.
  
  
  
  Related Information:
  
  Key Fields: In SAP, key fields are essential for uniquely identifying records in a table. They are crucial for operations like updates, deletes, and joins.
  Data Migration Tools: Familiarize yourself with the tools and methodologies used for data migration in SAP, such as SAP Data Services, SAP S/4HANA Migration Cockpit, or other ETL (Extract, Transform, Load) tools.
  Transaction Codes: Common transaction codes related to data dictionary and table management include SE11 (Data Dictionary), SE16 (Data Browser), and SE14 (Database Utility).
  
  By following these steps, you should be able to identify the root cause of the error and implement a suitable solution.