How To Fix OO293 - Parameter &1 &2 &3: only BYVALUE allowed ( event parameter )

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 293

• Message text: Parameter &1 &2 &3: only BYVALUE allowed ( event parameter )

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message OO293 - Parameter &1 &2 &3: only BYVALUE allowed ( event parameter ) ?

  The SAP error message OO293 indicates that there is an issue with the way parameters are being passed in an event in ABAP Object-Oriented programming. Specifically, it states that only parameters passed by value (BY VALUE) are allowed for event parameters.
  Cause:
  This error typically occurs when you attempt to define an event in a class and include parameters that are not compatible with the event's requirements. In ABAP, event parameters must be passed by value, meaning that the actual data is passed rather than a reference to the data. If you try to pass parameters by reference (BY REFERENCE), the system will raise this error.
  Solution:
  To resolve this error, you need to ensure that all parameters defined in the event are passed by value. Here are the steps you can take:
  
  
  Check Event Definition: Review the event definition in your class. Ensure that all parameters are defined correctly and are intended to be passed by value.
  
  
  Modify Parameter Types: If you have defined any parameters as reference types (e.g., using TYPE REF TO), change them to value types. For example, if you have a parameter defined as a reference to an object, consider changing it to a value type that represents the data you need.
  
  
  Recompile the Code: After making the necessary changes, recompile your code to ensure that the changes take effect.
  
  
  Test the Event: After recompiling, test the event to ensure that it works as expected without raising the error.
  
  
  Related Information:
  
  
  Event Handling in ABAP: In ABAP, events are used to signal that something has occurred, and they can be handled by event handlers (methods). Understanding how to define and handle events correctly is crucial for effective object-oriented programming in ABAP.
  
  
  Parameter Passing in ABAP: Familiarize yourself with the differences between passing parameters by value and by reference in ABAP. This knowledge will help you avoid similar issues in the future.
  
  
  Documentation: Refer to the official SAP documentation for more details on event handling and parameter passing in ABAP. This can provide additional context and examples.
  
  
  By following these steps and understanding the underlying principles, you should be able to resolve the OO293 error and ensure that your event parameters are defined correctly.