How To Fix /PF1/MSG_LOG_GUI851 - Unknown constant value: &1

SAP Error Message - Details

• Message type: E = Error

• Message class: /PF1/MSG_LOG_GUI -

• Message number: 851

• Message text: Unknown constant value: &1

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.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /PF1/MSG_LOG_GUI851 - Unknown constant value: &1 ?

  The SAP error message /PF1/MSG_LOG_GUI851 Unknown constant value: &1 typically indicates that there is an issue with a constant value that the system is trying to interpret or process, but it cannot recognize it. This error can occur in various contexts, such as during the execution of a program, transaction, or report.
  Cause:
  
  Incorrect Configuration: The constant value being referenced may not be defined in the system or may have been deleted or modified incorrectly.
  Custom Development: If you are using custom programs or enhancements, the error may arise from hardcoded values or constants that are not properly defined.
  Transport Issues: If the error occurs after a transport, it could be due to missing objects or dependencies that were not transported correctly.
  Version Mismatch: If there are inconsistencies between different system versions (e.g., development, quality assurance, production), it may lead to this error.
  
  Solution:
  
  Check Configuration: Verify that the constant value referenced in the error message is correctly defined in the relevant configuration settings. This may involve checking customizing settings or constants in the relevant modules.
  Review Custom Code: If the error is occurring in a custom program, review the code to ensure that all constants are defined and initialized properly. Look for any hardcoded values that may not exist in the current environment.
  Transport Validation: If the error appeared after a transport, check the transport logs to ensure that all necessary objects were included and that there are no missing dependencies.
  Debugging: If you have access to the ABAP debugger, you can set breakpoints to identify where the error is occurring and inspect the values being processed at that point.
  Consult Documentation: Check SAP notes or documentation related to the specific transaction or program to see if there are known issues or patches available.
  Contact SAP Support: If the issue persists and you cannot find a resolution, consider reaching out to SAP support for assistance, providing them with the error details and context.
  
  Related Information:
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide guidance on similar issues.
  Community Forums: Check SAP Community forums or other user groups where similar issues may have been discussed.
  Transaction Codes: If applicable, identify the transaction code or program where the error occurs to narrow down the context of the issue.
  
  By following these steps, you should be able to diagnose and resolve the error message /PF1/MSG_LOG_GUI851 Unknown constant value: &1.