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

CNV_DCII_COMM004 - Overview

• 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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CNV_DCII_COMM004 - Details

• 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