How To Fix SCRL555 - Only importing parameters may be declared optional.

SAP Error Message - Details

• Message type: E = Error

• Message class: SCRL - Messages for custom resuse libraries

• Message number: 555

• Message text: Only importing parameters may be declared optional.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SCRL555 - Only importing parameters may be declared optional. ?

  The SAP error message SCRL555, which states "Only importing parameters may be declared optional," typically occurs in ABAP when you are defining a method or function module and you attempt to declare an optional parameter that is not an importing parameter. 
  Cause:
  In ABAP, when defining methods or function modules, parameters can be categorized as:
  
  Importing: Parameters that are passed into the method/function.
  Exporting: Parameters that are returned from the method/function.
  Changing: Parameters that can be both input and output.
  Tables: Parameters that are used to pass internal tables.
  
  The error SCRL555 arises when you try to declare an optional parameter that is not of the importing type. Only importing parameters can be declared as optional. For example, if you try to declare an optional exporting or changing parameter, you will encounter this error.
  Solution:
  To resolve this error, you need to ensure that only importing parameters are declared as optional. Here’s how you can do that:
  
  
  Check Parameter Types: Review the parameters in your method/function definition. Ensure that only importing parameters are marked as optional.
  
  
  Modify Parameter Declaration: If you have mistakenly declared an exporting or changing parameter as optional, remove the optional declaration or change the parameter type to importing if that fits your logic.
  
  
  Example:
  METHOD my_method.
    IMPORTING
      VALUE(param1) TYPE string OPTIONAL  " Correct: importing parameter can be optional
    EXPORTING
      VALUE(param2) TYPE string.          " Incorrect: cannot be optional
  ENDMETHOD.
  In the above example, if param2 were to be declared as optional, it would cause the SCRL555 error. You should remove the OPTIONAL keyword from param2.
  
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP ABAP documentation for more details on parameter types and method definitions.
  SAP Community: You can find discussions and solutions related to similar errors in the SAP Community forums.
  Debugging: If you are unsure about the parameter types, you can use the ABAP debugger to inspect the method/function call and see how parameters are being passed.
  
  By following these steps, you should be able to resolve the SCRL555 error and correctly define your method or function parameters.