How To Fix OL804 - CallBack function '&' not defined

OL804 - Overview

• Message type: E = Error

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

• Message number: 804

• Message text: CallBack function '&' not defined

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message OL804 - CallBack function '&' not defined ?

  The SAP error message OL804, which states "CallBack function '&' not defined," typically occurs in the context of SAP ABAP programming, particularly when dealing with function modules or methods that are expected to call a callback function that has not been defined or is not accessible in the current context.
  
  Cause:
  
  Undefined Callback Function: The callback function that is being referenced in the code is not defined in the program or is misspelled.
  Scope Issues: The callback function may be defined in a different scope or context that is not accessible from where it is being called.
  Incorrect Function Signature: The function signature of the callback may not match what is expected, leading to the system not recognizing it.
  Missing Includes or Libraries: If the callback function is part of an include or library that has not been included in the program, it will not be recognized.
  
  
  Solution:
  
  Check Function Definition: Ensure that the callback function is