How To Fix OL621 - Exceptions are not allowed for asynchronous method '&'

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 621

• Message text: Exceptions are not allowed for asynchronous method '&'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message OL621 - Exceptions are not allowed for asynchronous method '&' ?

  The SAP error message OL621, which states "Exceptions are not allowed for asynchronous method '&'", typically occurs in the context of ABAP programming when you are trying to define an asynchronous method that is expected to handle exceptions. In ABAP, asynchronous methods are not allowed to raise exceptions, which is why you encounter this error.
  Cause:
  The primary cause of this error is that the method you are trying to define as asynchronous is attempting to declare exceptions in its signature. In ABAP, asynchronous methods are designed to run independently of the calling program, and as such, they cannot propagate exceptions back to the caller. This is a design choice to ensure that the calling program does not have to handle exceptions that occur in an asynchronous context.
  Solution:
  To resolve this error, you need to modify the method definition to ensure that it does not declare any exceptions. Here are the steps you can take:
  
  
  Remove Exception Declarations: Go to the method definition in your ABAP class or interface and remove any exception declarations from the method signature.
  For example, change:
  METHOD my_async_method
    IMPORTING
      VALUE(param) TYPE string
    EXCEPTIONS
      my_exception = 1.
  To:
  METHOD my_async_method
    IMPORTING
      VALUE(param) TYPE string.
  
  
  Handle Errors Internally: If you need to handle errors that may occur during the execution of the asynchronous method, consider implementing internal error handling within the method itself. You can log errors, send notifications, or handle them in a way that does not require raising exceptions.
  
  
  Use Return Parameters: If you need to return status information or error codes, consider using return parameters instead of exceptions. You can define a return parameter that indicates success or failure.
  
  
  Related Information:
  
  
  Asynchronous Method Characteristics: Understand that asynchronous methods are designed to run in the background and do not block the calling program. They are typically used for long-running processes or tasks that can be executed independently.
  
  
  Error Handling in Asynchronous Contexts: Since exceptions cannot be propagated, consider using logging mechanisms or status messages to communicate the outcome of the asynchronous operation.
  
  
  Documentation: Refer to the official SAP documentation for more details on asynchronous programming in ABAP, including best practices and examples.
  
  
  By following these guidelines, you should be able to resolve the OL621 error and successfully implement your asynchronous method without exceptions.