How To Fix WS_TOOL858 - Function &1: &2 parameter &3 is no longer optional

SAP Error Message - Details

• Message type: E = Error

• Message class: WS_TOOL - Message Class for Web Services and Virtual Endpoints

• Message number: 858

• Message text: Function &1: &2 parameter &3 is no longer optional

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WS_TOOL858 - Function &1: &2 parameter &3 is no longer optional ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WS_TOOL858 Function &1: &2 parameter &3 is no longer optional
  
  Cause:
  This error occurs when a function module or method call in ABAP or a related tool (such as Web Services or SAP Gateway) uses a parameter that was previously optional, but in the current version of the function, the parameter has been changed to mandatory (no longer optional).
  In other words, the interface of the function module or method has changed in a newer SAP release or patch, and the calling program or tool has not been updated accordingly. The system now requires that the parameter be explicitly provided, but the call is missing it.
  
  Explanation:
  
  &1 = Function name (e.g., function module or method)
  &2 = Parameter type or description (e.g., IMPORTING, EXPORTING, CHANGING)
  &3 = Parameter name that is no longer optional
  
  For example, if the function module Z_MY_FUNCTION had an importing parameter IV_DATE that was optional before, but now it is mandatory, and your code calls Z_MY_FUNCTION without passing IV_DATE, this error will be raised.
  
  Solution:
  
  
  Check the function module or method interface:
  
  Use transaction SE37 (Function Builder) or SE24 (Class Builder) to check the current interface of the function or method.
  Verify which parameters are mandatory and which are optional.
  
  
  
  Update the calling code:
  
  Modify the ABAP code or tool configuration that calls the function to include the now mandatory parameter.
  Provide a valid value for the parameter as required by the business logic.
  
  
  
  Check SAP Notes / Documentation:
  
  Sometimes SAP changes function interfaces in support packages or upgrades.
  Review relevant SAP Notes or upgrade documentation for changes in function module interfaces.
  
  
  
  Test the changes:
  
  After updating the call, test the function to ensure it works correctly with the mandatory parameter.
  
  
  
  
  Related Information:
  
  This error is common after system upgrades or applying support packages where SAP may have tightened the interface contracts.
  It is important to keep custom code and integrations in sync with SAP standard changes.
  If the function is a standard SAP function module or method, check SAP Help Portal or SAP Notes for interface changes.
  If the function is custom-developed, coordinate with the development team to understand why the parameter was made mandatory and what values should be passed.
  
  
  Example:
  Before (optional parameter):
  CALL FUNCTION 'Z_MY_FUNCTION'
    EXPORTING
      IV_DATE = ' '.
  After (mandatory parameter):
  CALL FUNCTION 'Z_MY_FUNCTION'
    EXPORTING
      IV_DATE = sy-datum. " Pass current date or appropriate value
  
  If you provide the actual function name and parameter, I can help you with more specific guidance.