How To Fix AH640 - FM &1: Parameters &2 and &3 cannot be specified simultaneously

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 640

• Message text: FM &1: Parameters &2 and &3 cannot be specified simultaneously

What causes this issue?

Internal error: incorrect call of the function module
If you specify TWAERS as a table, do not enter TWAERS in the header.

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 AH640 - FM &1: Parameters &2 and &3 cannot be specified simultaneously ?

  The SAP error message AH640 typically occurs in the context of function modules (FM) when there is a conflict in the parameters being passed to the function. The message indicates that two parameters, specified as &2 and &3, cannot be used together in the same call to the function module &1.
  Cause:
  The error arises when the function module has been designed in such a way that certain parameters are mutually exclusive. This means that if one parameter is specified, the other cannot be used. The specific parameters involved will be indicated in the error message, replacing &2 and &3 with the actual parameter names.
  Solution:
  To resolve this error, you should:
  
  
  Review the Function Module Documentation: Check the documentation for the function module (FM) to understand the parameters and their intended use. This will help you identify which parameters are mutually exclusive.
  
  
  Modify the Parameter Usage: Adjust your code to ensure that you are not passing both parameters at the same time. You will need to decide which parameter is necessary for your specific use case and remove the other.
  
  
  Test the Changes: After making the necessary adjustments, test the function module call again to ensure that the error is resolved.
  
  
  Related Information:
  
  
  Function Module Documentation: You can access the documentation for the function module in the SAP system by using transaction SE37 (Function Module) and entering the name of the function module. This will provide detailed information about the parameters and their usage.
  
  
  Debugging: If you are unsure which parameters are causing the issue, you can use the debugger to step through the code and inspect the values being passed to the function module.
  
  
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide additional context.
  
  
  Community Forums: If you are still having trouble, consider reaching out to SAP community forums or support channels where other SAP professionals may have encountered and resolved similar issues.
  
  
  By following these steps, you should be able to identify the cause of the error and implement a solution effectively.