How To Fix AG501 - Program error: incorrect call of function &1 using parameter &2

SAP Error Message - Details

• Message type: E = Error

• Message class: AG - Nachrichten ATP-Server

• Message number: 501

• Message text: Program error: incorrect call of function &1 using parameter &2

What causes this issue?

Programming error: when function module &1 was called, parameter &2 was
not filled correctly.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AG501 - Program error: incorrect call of function &1 using parameter &2 ?

  The SAP error message AG501 indicates that there is a program error due to an incorrect call of a function module or method, specifically with the parameters being passed to it. This error typically arises when the function module is not being called with the expected parameters or when the parameters do not match the expected data types or structures.
  Causes:
  
  Incorrect Parameter Types: The parameters being passed to the function do not match the expected data types or structures defined in the function module.
  Missing Parameters: Required parameters are not being passed to the function call.
  Incorrect Function Module: The wrong function module is being called, which does not support the parameters being passed.
  Program Logic Errors: There may be logical errors in the program that lead to incorrect function calls.
  Changes in Function Module: If the function module has been modified (e.g., added or removed parameters), existing calls may no longer be valid.
  
  Solutions:
  
  Check Function Module Definition: Review the definition of the function module being called (using transaction SE37 or SE80) to ensure that the parameters being passed match the expected types and structures.
  Validate Parameter Values: Ensure that the values being passed to the function are valid and conform to the expected formats.
  Debugging: Use the ABAP debugger to step through the code and identify where the incorrect function call is being made. This can help pinpoint the exact parameters being passed.
  Review Program Logic: Check the surrounding code to ensure that the logic leading up to the function call is correct and that all necessary parameters are being set properly.
  Consult Documentation: If the function module is part of a standard SAP package, consult the SAP documentation or notes for any changes or updates that may affect its usage.
  
  Related Information:
  
  Transaction Codes: Use SE37 to view and edit function modules, and SE80 for broader object navigation.
  SAP Notes: Check for any relevant SAP Notes that may address known issues with the function module in question.
  ABAP Development: Familiarity with ABAP programming and debugging techniques will be beneficial in resolving this error.
  Testing: After making changes, thoroughly test the program to ensure that the error is resolved and that the function behaves as expected.
  
  If the issue persists after following these steps, consider reaching out to your SAP support team or consulting with an experienced ABAP developer for further assistance.