How To Fix FL384 - No CHANGING parameters allowed with RFC

SAP Error Message - Details

• Message type: E = Error

• Message class: FL - Function Builder messages

• Message number: 384

• Message text: No CHANGING parameters allowed with RFC

What causes this issue?

You attempted to create a CHANGING parameter for a remotely called
function module. However, remotely called function modules do not
support CHANGING parameters.

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 FL384 - No CHANGING parameters allowed with RFC ?

  The SAP error message FL384 ("No CHANGING parameters allowed with RFC") typically occurs when you are trying to call a Remote Function Call (RFC) that has a function module with CHANGING parameters. In RFC-enabled function modules, CHANGING parameters are not allowed because the RFC interface does not support them. 
  Cause:
  The primary cause of this error is that the function module you are trying to call via RFC has parameters defined as CHANGING. In an RFC context, all parameters must be either IMPORTING or EXPORTING. CHANGING parameters are not supported because they imply that the data can be modified, which is not feasible in a remote call scenario.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check the Function Module Definition:
  
  Go to transaction SE37 (Function Module) and check the definition of the function module you are trying to call.
  Look for any parameters defined as CHANGING.
  
  
  
  Modify the Function Module:
  
  If you have access and the ability to modify the function module, consider changing the CHANGING parameters to either IMPORTING or EXPORTING parameters.
  If the function module is part of a standard SAP package, you may need to create a Z (custom) version of the function module to make the necessary changes.
  
  
  
  Create a Wrapper Function Module:
  
  If you cannot modify the original function module, you can create a new wrapper function module that calls the original function module and uses IMPORTING parameters instead of CHANGING.
  In this wrapper, you can handle the data manipulation and return the results through EXPORTING parameters.
  
  
  
  Review RFC Calls:
  
  Ensure that any RFC calls you are making are using the correct parameters as per the function module's definition.
  
  
  
  Related Information:
  
  RFC (Remote Function Call): A protocol used in SAP to enable communication between different SAP systems or between SAP and non-SAP systems.
  Function Module: A reusable piece of code in SAP that can be called from other programs or function modules.
  Parameter Types:
  
  IMPORTING: Used to pass data into the function module.
  EXPORTING: Used to return data from the function module.
  CHANGING: Used to pass data into the function module and return modified data, but not allowed in RFC.
  
  
  
  By following these steps, you should be able to resolve the FL384 error and successfully call the desired function module via RFC.