How To Fix KN456 - Locked key fields must be output

SAP Error Message - Details

• Message type: E = Error

• Message class: KN - Reporting for Costing

• Message number: 456

• Message text: Locked key fields must be output

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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Smart SAP Assistant

• What is the cause and solution for SAP error message KN456 - Locked key fields must be output ?

  The SAP error message KN456 ("Locked key fields must be output") typically occurs in the context of data processing in SAP, particularly when dealing with master data records such as customer or vendor data. This error indicates that certain key fields that are required for processing are locked and must be included in the output.
  Cause:
  
  Locked Key Fields: The error usually arises when the system is trying to process a transaction or report that requires certain key fields (like customer number, vendor number, etc.) to be included in the output, but these fields are locked or not accessible.
  Data Integrity Issues: There may be issues with data integrity or consistency, where the system cannot retrieve the necessary key fields due to locks or restrictions.
  Authorization Issues: Sometimes, the user may not have the necessary authorizations to access certain key fields, leading to this error.
  
  Solution:
  
  Check Field Status: Ensure that the key fields required for the transaction are not locked. You can check the field status in the relevant configuration settings or transaction codes.
  Unlock Key Fields: If the fields are locked, you may need to unlock them. This can be done by an administrator or someone with the necessary permissions.
  Review Authorizations: Ensure that the user has the appropriate authorizations to access the key fields. This may involve checking user roles and permissions in the SAP system.
  Data Consistency Check: Run data consistency checks to ensure that there are no issues with the master data records. This can help identify any discrepancies that may be causing the error.
  Consult Documentation: Refer to SAP documentation or support notes related to the specific transaction or module you are working with for additional guidance.
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may need to use specific transaction codes to check or modify the data (e.g., SE11 for data dictionary, SE16 for table display).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common errors.
  Support: If the issue persists, consider reaching out to SAP support or your internal IT support team for further assistance.
  
  By following these steps, you should be able to resolve the KN456 error and ensure that the necessary key fields are available for processing.