How To Fix FL345 - You cannot use interface parameters as default values

SAP Error Message - Details

• Message type: E = Error

• Message class: FL - Function Builder messages

• Message number: 345

• Message text: You cannot use interface parameters as default values

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FL345 - You cannot use interface parameters as default values ?

  The SAP error message FL345, "You cannot use interface parameters as default values," typically occurs in the context of ABAP programming, particularly when dealing with function modules or methods in classes. This error indicates that you are trying to set a default value for a parameter in a function or method interface using another interface parameter, which is not allowed in ABAP.
  Cause:
  The primary cause of this error is the attempt to assign a default value to a parameter using another parameter from the same interface. In ABAP, default values for parameters must be constants or literals, not variables or parameters from the interface.
  Solution:
  To resolve this error, you need to ensure that default values for interface parameters are defined using constants or literals. Here are the steps you can take:
  
  
  Remove Default Values: If you have set a default value for a parameter using another parameter, remove that default value.
  
  
  Use Constants: If you need a default value, consider using a constant or a literal value instead. For example:
  FUNCTION my_function.
    IMPORTING
      VALUE(param1) TYPE string DEFAULT 'default_value'.
  ENDFUNCTION.
  
  
  Set Default Values in the Implementation: If you need to use the value of another parameter, you can set it within the implementation of the function or method instead of in the interface definition. For example:
  FUNCTION my_function.
    IMPORTING
      VALUE(param1) TYPE string
      VALUE(param2) TYPE string.
    IF param2 IS INITIAL.
      param2 = param1. " Assigning value from param1 to param2
    ENDIF.
  ENDFUNCTION.
  
  
  Review Parameter Usage: Ensure that you are not trying to use interface parameters in a way that violates ABAP's rules regarding default values.
  
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP ABAP documentation for more details on function modules, method interfaces, and parameter handling.
  SAP Community: You can find discussions and solutions related to this error on the SAP Community forums, where other developers may have encountered similar issues.
  Debugging: If you are unsure where the error is occurring, use the ABAP debugger to step through your code and identify the specific line causing the issue.
  
  By following these guidelines, you should be able to resolve the FL345 error and ensure that your ABAP code adheres to the language's constraints regarding interface parameters.