How To Fix SPXN184 - RFC consumer operation incompatible: sync / async flag does not match

SAP Error Message - Details

• Message type: E = Error

• Message class: SPXN - Proxy Generation

• Message number: 184

• Message text: RFC consumer operation incompatible: sync / async flag does not match

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message SPXN184 - RFC consumer operation incompatible: sync / async flag does not match ?

  The SAP error message SPXN184 indicates that there is a mismatch between the synchronous and asynchronous flags in an RFC (Remote Function Call) consumer operation. This typically occurs when a function module is called in a way that does not align with its defined execution mode.
  Cause:
  
  Mismatch in Call Type: The function module being called is defined as synchronous (i.e., it expects a synchronous call) but is being invoked asynchronously, or vice versa.
  Configuration Issues: The RFC destination or the settings in the calling program may not be configured correctly to match the expected call type.
  Incorrect Function Module Usage: The function module may have been designed for a specific type of operation (synchronous or asynchronous), and the calling program is not adhering to that design.
  
  Solution:
  
  Check Function Module Definition: Verify the definition of the function module in the SAP system. Ensure that you understand whether it is designed for synchronous or asynchronous calls.
  Adjust Call Method: Modify the calling program to match the expected call type:
  
  If the function module is synchronous, ensure that it is called in a synchronous manner.
  If it is asynchronous, ensure that the call is made accordingly.
  
  
  Review RFC Destination Settings: Check the settings of the RFC destination being used. Ensure that it is configured to support the type of call you are making.
  Error Handling: Implement error handling in your code to catch and manage such mismatches gracefully.
  Consult Documentation: Refer to the SAP documentation for the specific function module to understand its intended use and any constraints.
  
  Related Information:
  
  Synchronous RFC (sRFC): This is a type of RFC where the caller waits for the function to complete before continuing.
  Asynchronous RFC (aRFC): This allows the caller to continue processing without waiting for the function to complete.
  Transactional RFC (tRFC): This ensures that the function call is executed exactly once, even in the case of failures.
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide additional guidance on this error.
  
  If the issue persists after following these steps, consider reaching out to your SAP Basis team or consulting SAP support for further assistance.