How To Fix WU073 - Unvalid function during function module call (1,2,3 are allowed)

WU073 - Overview

• Message type: E = Error

• Message class: WU - Promotion management messages

• Message number: 073

• Message text: Unvalid function during function module call (1,2,3 are allowed)

What causes this issue?

The function module for saving a promotion module was called
incorrectly.

How to fix this error?

INCLUDE ISR_SYSTEMFEHLER

Error message extract from SAP system. Copyright SAP SE.

WU073 - Details

• The SAP error message WU073, which states "Invalid function during function module call (1,2,3 are allowed)," typically occurs when there is an issue with the parameters being passed to a function module in SAP. This error indicates that the function module is expecting a specific type of input, but the input provided does not match the expected values.
  
  Cause:
  
  Invalid Function Code: The function module is expecting a function code of 1, 2, or 3, but a different value is being passed.
  Incorrect Parameter Mapping: The parameters being passed to the function module may not be correctly mapped or may be missing.
  Custom Code Issues: If the function module is part of a custom development, there may be issues in the custom code that lead to this error.
  Data Type Mismatch: The data type of the input parameters may not match what the function module expects.
  
  
  Solution:
  
  Check Function Module Documentation: Review the documentation for the function