How To Fix AH641 - FM &1: parameter &2 is required

SAP Error Message - Details

• Message type: E = Error

• Message class: AH - IS-U billing (master data)

• Message number: 641

• Message text: FM &1: parameter &2 is required

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message AH641 - FM &1: parameter &2 is required ?

  The SAP error message AH641, which states "FM &1: parameter &2 is required," typically occurs when a function module (FM) is called without providing a required parameter. This error indicates that the function module expects a certain parameter to be passed to it, but it was not included in the call.
  Cause:
  
  Missing Parameter: The most common cause is that the function module is being called without one or more required parameters.
  Incorrect Function Module Usage: The function module may be used incorrectly, either by misunderstanding its interface or by not adhering to the expected input/output parameters.
  Changes in Function Module: If the function module has been modified (e.g., by an upgrade or a custom development), the required parameters may have changed.
  
  Solution:
  
  Check Function Module Documentation: Review the documentation for the function module to understand which parameters are required. You can do this by navigating to the function module in transaction SE37 or SE80 and checking the "Import" and "Export" parameters.
  Update the Call: Ensure that your code includes all required parameters when calling the function module. For example, if the function module requires a parameter named PARAM1, make sure it is included in the call.
  Debugging: If you are unsure which parameter is missing, you can use the debugger to step through the code and see the parameters being passed to the function module.
  Consult with Colleagues or SAP Support: If you are still having trouble, consider reaching out to colleagues who may have experience with the specific function module or consult SAP support for assistance.
  
  Related Information:
  
  Function Module Interface: Always refer to the function module's interface to understand the parameters it requires.
  SAP Notes: Check for any relevant SAP Notes that might address known issues or changes related to the function module.
  Transaction Codes: Use transaction codes like SE37 (Function Builder) or SE80 (Object Navigator) to explore and analyze the function module in question.
  Error Handling: Implement error handling in your code to gracefully manage situations where required parameters are not provided.
  
  By following these steps, you should be able to resolve the AH641 error and ensure that the function module is called correctly with all necessary parameters.