How To Fix OL329 - Asynchronous processing does not allow a result parameter

SAP Error Message - Details

• Message type: E = Error

• Message class: OL - Workflow object types: Run-time system

• Message number: 329

• Message text: Asynchronous processing does not allow a result parameter

What causes this issue?

You have defined this method as asynchronous. Asynchronous methods do
not have return parameters due to their call semantics.

How to fix this error?

Either define the method as a synchronous method or do not specify any
result parameters for the method.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OL329 - Asynchronous processing does not allow a result parameter ?

  The SAP error message OL329, which states "Asynchronous processing does not allow a result parameter," typically occurs in the context of using asynchronous function modules or methods in ABAP (Advanced Business Application Programming). This error indicates that you are trying to use a result parameter in a function module that is designed to be executed asynchronously, which is not allowed.
  Cause:
  The primary cause of this error is that asynchronous function calls in SAP do not support returning result parameters. When a function module is called asynchronously, it is executed in a separate process, and the calling program does not wait for the result. Therefore, any parameters intended to return results (output parameters) cannot be used in this context.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Remove Result Parameters: If you are calling an asynchronous function module, ensure that you do not include any result parameters in the function call. Instead, use other means to retrieve the results, such as:
  
  Using a database table to store results that can be accessed later.
  Using a callback mechanism if applicable.
  
  
  
  Use Synchronous Calls: If you need to retrieve results immediately, consider using a synchronous function module instead of an asynchronous one. This way, you can include result parameters without encountering the error.
  
  
  Check Function Module Definition: Review the definition of the function module you are calling. Ensure that it is intended for asynchronous processing and that you are adhering to its requirements.
  
  
  Review Documentation: Consult the SAP documentation for the specific function module you are using to understand its parameters and intended usage.
  
  
  Related Information:
  
  
  Asynchronous Processing: In SAP, asynchronous processing is often used for long-running tasks where the calling program does not need to wait for the task to complete. This is common in scenarios like background processing or when using the CALL FUNCTION ... STARTING NEW TASK statement.
  
  
  Function Module Types: Understand the difference between synchronous and asynchronous function modules. Synchronous function modules return results immediately, while asynchronous ones do not.
  
  
  Error Handling: Implement error handling in your code to manage situations where asynchronous processing may fail or not return expected results.
  
  
  By following these guidelines, you should be able to resolve the OL329 error and effectively manage asynchronous function calls in your SAP environment.