How To Fix AD604 - Field & must be a key field

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 604

• Message text: Field & must be a key field

What causes this issue?

The specified field is not defined as a key field.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Please define this field as a key field.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD604 - Field & must be a key field ?

  The SAP error message AD604 ("Field & must be a key field") typically occurs when you are trying to perform an operation that requires a specific field to be a key field, but it is not defined as such in the database table or structure you are working with. This error is often encountered in the context of data modeling, table definitions, or when working with certain transactions that require key fields for identification.
  
  Cause:
  
  Field Definition: The field you are trying to use is not defined as a key field in the underlying database table or structure.
  Data Model Issues: If you are working with a data model (like in ABAP Dictionary), the field may not be marked as a key field in the table definition.
  Transaction Requirements: Certain transactions or operations may require that specific fields be key fields to ensure data integrity and uniqueness.
  
  
  Solution:
  
  Check Table Definition: Go to the Data Dictionary