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 (transaction SE11) and check the definition of the table you are working with. Ensure that the field in question is marked as a key field.
  Modify Field Attributes: If you have the necessary authorizations, you can modify the table definition to make the field a key field. This typically involves:
  
  Opening the table in SE11.
  Selecting the field and changing its attributes to mark it as a key field.
  Activating the table after making changes.
  
  
  Review Related Transactions: If you are using a specific transaction, review the documentation or configuration to ensure that you are using the correct fields as required by the transaction.
  Consult with a Developer: If you are not familiar with the data model or do not have the necessary permissions, consult with an ABAP developer or a functional consultant who can assist in making the necessary changes.
  
  Related Information:
  
  Key Fields: Key fields are essential for uniquely identifying records in a database table. They are used in primary keys and are critical for maintaining data integrity.
  Data Dictionary (SE11): This is the transaction code used to access the Data Dictionary in SAP, where you can view and modify table definitions.
  Authorization: Ensure you have the necessary authorizations to make changes to table definitions, as this is typically restricted to certain user roles.
  
  If you continue to encounter issues after checking the above points, it may be helpful to look at the specific context in which the error occurs, as there may be additional factors at play.