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How To Fix WD500 - Parameter & is a constant


SAP Error Message - Details

  • Message type: E = Error

  • Message class: WD - Workflow definition

  • Message number: 500

  • Message text: Parameter & is a constant

  • Show details Hide details
  • What causes this issue?

    You have entered a constant as a parameter for the user decision.

    System Response

    At runtime, the parameter is replaced by the constant you have entered.
    It is therefore unnecessaty to use the variable. You can write the text
    directly in the title of the user decision.

    How to fix this error?

    However, if you wish to display the CONTENTS of a container element or
    an object variable at runtime, you must enter a valid expression for a
    variable or a system field using F4 possible entries help.

    Error message extract from SAP system. Copyright SAP SE.


Smart SAP Assistant

  • What is the cause and solution for SAP error message WD500 - Parameter & is a constant ?

    SAP Error Message:
    WD500 Parameter & is a constant


    Cause:

    This error typically occurs in the context of Web Dynpro ABAP programming. The message indicates that a parameter, which is expected to be a variable or a reference, is instead a constant value. In other words, the code or configuration is trying to pass a constant (literal value) where a parameter (variable or reference) is required.

    For example, this can happen if you try to pass a literal string or number directly to a method or function that expects a parameter to be a variable or a reference, or if you try to assign a constant to a parameter that is defined as a changing or exporting parameter.


    Common Scenarios:

    • Passing a literal value (e.g., 'X', 1, 'constant') to a method parameter that expects a variable or reference.
    • Incorrect usage of parameters in method calls or event handlers in Web Dynpro components.
    • Misconfiguration in the context mapping or method interface where constants are used instead of variables.

    Solution:

    • Check the method or function interface: Verify the parameter definitions. If the parameter is defined as CHANGING or EXPORTING by reference, you cannot pass a constant or literal value.

    • Pass a variable instead of a constant: Declare a variable in your code, assign the constant value to it, and then pass the variable to the method.

      DATA lv_value TYPE string.
      lv_value = 'X'.
      CALL METHOD some_method
        EXPORTING
          param = lv_value.
    • Review the Web Dynpro context and method calls: Ensure that the parameters passed in the context mapping or method calls are variables or references, not constants.

    • Check the event handler implementations: Sometimes, event handlers expect parameters to be variables; passing constants directly can cause this error.


    Related Information:

    • This error is specific to Web Dynpro ABAP development.
    • It is related to ABAP syntax and parameter passing rules.
    • The error message number WD500 is a Web Dynpro message class.
    • Refer to SAP documentation on Web Dynpro ABAP parameter passing and method interface definitions.
    • Debugging the method call stack and checking the parameter values can help identify where the constant is incorrectly passed.

    Summary:

    Aspect Details
    Error WD500 Parameter & is a constant
    Cause Passing a constant (literal) where a variable/reference parameter is expected
    Solution Pass a variable instead of a constant; check method parameter definitions and usage
    Context Web Dynpro ABAP method calls, event handlers, context mapping

    If you provide the specific code snippet or scenario where this error occurs, I can help you with a more precise fix.

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