How To Fix TN004 - Invalid WHEN parameter in function module

TN004 - Overview

• Message type: E = Error

• Message class: TN - Support Package Manager (SPAM) Messages

• Message number: 004

• Message text: Invalid WHEN parameter in function module

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message TN004 - Invalid WHEN parameter in function module ?

  The SAP error message TN004, which states "Invalid WHEN parameter in function module," typically occurs in the context of using the WHEN statement in a function module or a report. This error indicates that the WHEN parameter provided does not match any of the expected values or conditions defined in the function module.
  Causes:
  
  Incorrect Parameter Value: The value passed to the WHEN parameter does not match any of the predefined cases in the function module.
  Data Type Mismatch: The data type of the parameter being passed may not be compatible with what the function module expects.
  Missing or Incorrect Logic: The logic defined in the function module may not account for the value being passed, leading to an invalid condition.
  
  Configuration Issues: If the function module relies on configuration settings, any discrepancies in those settings could lead to this error.
  
  Solutions:
  
  Check Parameter Values: Review the values being passed to the WHEN parameter. Ensure they are