How To Fix FDT_EXPRESSIONS805 - Interface &1 from method &2 is not correct

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_EXPRESSIONS - Formula & Derivation Tool: Expressions

• Message number: 805

• Message text: Interface &1 from method &2 is not correct

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS805 - Interface &1 from method &2 is not correct ?

  The SAP error message FDT_EXPRESSIONS805 typically indicates that there is an issue with the interface of a method in the context of the SAP Fiori or SAP UI5 applications, particularly when dealing with expressions in the context of the FDT (Form Data Tool) or similar frameworks.
  Cause:
  The error message suggests that the interface of a method (denoted as &2) from a specific interface (denoted as &1) is not correct. This could be due to several reasons, including:
  
  Incorrect Method Signature: The method may not have the expected parameters or return types as defined in the interface.
  Missing Implementation: The method might not be implemented correctly or is missing altogether.
  Data Type Mismatch: There could be a mismatch in the expected data types of the parameters being passed to the method.
  Versioning Issues: If there are multiple versions of the interface or method, the wrong version might be referenced.
  Configuration Issues: There may be configuration settings in the FDT or related tools that are not set up correctly.
  
  Solution:
  To resolve the error, you can follow these steps:
  
  
  Check Method Signature: Verify that the method signature matches the expected interface definition. Ensure that the parameters and return types are correct.
  
  
  Implement Missing Methods: If the method is not implemented, ensure that it is properly implemented in the relevant class or service.
  
  
  Review Data Types: Check the data types of the parameters being passed to the method. Ensure they match the expected types defined in the interface.
  
  
  Check Interface Version: If there are multiple versions of the interface, ensure that the correct version is being used in your implementation.
  
  
  Debugging: Use debugging tools to trace the execution and identify where the mismatch occurs. This can help pinpoint the exact location of the issue.
  
  
  Consult Documentation: Review the SAP documentation related to the FDT and the specific interfaces you are working with to ensure compliance with the expected standards.
  
  
  Seek Help from SAP Community: If the issue persists, consider reaching out to the SAP community forums or support for additional assistance.
  
  
  Related Information:
  
  SAP Fiori and UI5 Documentation: Familiarize yourself with the official SAP documentation for Fiori and UI5, which provides guidelines on method implementations and interface definitions.
  SAP Notes: Check for any relevant SAP Notes that might address known issues or provide patches related to the error message.
  Version Control: Keep track of changes in your development environment, especially if multiple developers are working on the same project.
  
  By following these steps, you should be able to identify and resolve the issue causing the FDT_EXPRESSIONS805 error message.