How To Fix WG400 - Invalid input parameter (&1 = &2) calling FM: &3!

SAP Error Message - Details

• Message type: E = Error

• Message class: WG - Messages for store order and investment buy

• Message number: 400

• Message text: Invalid input parameter (&1 = &2) calling FM: &3!

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WG400 - Invalid input parameter (&1 = &2) calling FM: &3! ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WG400 Invalid input parameter (&1 = &2) calling FM: &3
  
  Meaning / Cause:
  This error occurs when a function module (FM) is called with an invalid or unexpected input parameter. The message indicates that the parameter name (&1) has an invalid value (&2) when calling the function module (&3).
  In other words, the program or user is passing a parameter value that the function module does not accept or recognize, leading to the error.
  
  Common Causes:
  
  Incorrect or missing parameter values in the function module call.
  Data inconsistencies or wrong data types passed to the FM.
  Custom code or user-exits/enhancements passing invalid parameters.
  Incorrect configuration or master data leading to invalid parameter values.
  Programming errors where the parameter is not properly initialized or populated.
  
  
  Typical Scenario:
  This message is often seen in SAP Workflow (WG* messages are related to Workflow) when a workflow container or step calls a function module with wrong input parameters.
  
  How to Analyze:
  
  
  Check the message details:  
  
  &1 = Parameter name  
  &2 = Parameter value  
  &3 = Function module name
  
  
  
  Review the function module interface:
  
  Look at the FM (&3) in SE37 or SE80 to understand what parameters it expects.
  
  
  Trace the call:
  
  Use debugging or system trace (ST05) to see where the FM is called and what values are passed.
  
  
  Check the workflow container or calling program:
  
  If this is in a workflow, check the container values or the step that calls the FM.
  
  
  Validate data:
  
  Ensure that the data passed as parameters is valid and consistent with the FM’s expected input.
  
  
  
  Solution / Resolution:
  
  Correct the input parameter value (&2) for the parameter (&1) before calling the function module (&3).
  Fix any custom code or user-exits that pass invalid parameters.
  Adjust workflow container values or step parameters to ensure valid data.
  If the parameter value is derived from master data or configuration, correct the underlying data.
  Test the FM call independently in SE37 with the same parameters to verify correctness.
  If necessary, consult SAP Notes or OSS for known issues related to the FM.
  
  
  Additional Information:
  
  Message Class: WG (Workflow)
  Message Number: 400
  This message is part of SAP Workflow error handling.
  The error helps prevent incorrect processing by ensuring only valid data is passed to function modules.
  If the FM is a standard SAP FM, check SAP documentation or OSS notes for specific parameter requirements.
  If the FM is custom, review the code and parameter validation logic.
  
  
  Example:
  If the message says:
  
  WG400 Invalid input parameter (TASK_ID = 12345) calling FM: SAP_WAPI_CREATE_TASK
  It means the FM SAP_WAPI_CREATE_TASK was called with a TASK_ID parameter value 12345 which is invalid or unexpected.
  
  If you provide the actual parameter names, values, and FM name from your error message, I can help you analyze it more specifically.
  
  Summary:
  
  The error indicates invalid input parameters passed to a function module, typically in workflow processing. The solution is to identify and correct the invalid parameter values before the FM call.
  
  If you need help debugging or fixing a specific instance, please share the exact message details!