How To Fix CMAC_FEE_CALC021 - Cannot register event handler for ALV tree

CMAC_FEE_CALC021 - Overview

• Message type: E = Error

• Message class: CMAC_FEE_CALC - Messages for Student Accounting

• Message number: 021

• Message text: Cannot register event handler for ALV tree

What causes this issue?

The system cannot register the event handler for the ALV tree.

System Response

The program will be terminated.

How to fix this error?

Contact your system administrator.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CMAC_FEE_CALC021 - Cannot register event handler for ALV tree ?

  The SAP error message CMAC_FEE_CALC021 indicates that there is an issue with registering an event handler for an ALV (ABAP List Viewer) tree. This error typically arises in the context of using ALV trees in ABAP programs, particularly when trying to handle events related to the tree structure.
  Possible Causes:
  
  Incorrect Event Handler Definition: The event handler method may not be correctly defined or may not match the expected signature.
  Missing or Incorrect Object Reference: The object reference for the ALV tree may not be correctly instantiated or may be null.
  Incompatible Data Types: The data types used in the event handler may not be compatible with what the ALV tree expects.
  Programming Errors: There may be syntax errors or logical errors in the code that prevent the event handler from being registered.
  Authorization Issues: Sometimes, authorization issues can prevent certain operations from being executed.
  
  Solutions:
  
  
  Check Event Handler Definition:
  
  Ensure that the event handler method is defined correctly