How To Fix TPDA193 - You cannot switch to the classic debugger here

TPDA193 - Overview

• Message type: E = Error

• Message class: TPDA - Debugger

• Message number: 193

• Message text: You cannot switch to the classic debugger here

What causes this issue?

For technical reasons you cannot switch to the classical ABAP Debugger
here. The classical Debugger cannot be activated in conversion exits or
field exits, for example.

How to fix this error?

As soon as you have left the conversion exit, for example, you can
switch to the classical Debugger again.

Error message extract from SAP system. Copyright SAP SE.

TPDA193 - Details

• The SAP error message TPDA193: "You cannot switch to the classic debugger here" typically occurs when you attempt to switch from the new debugger to the classic debugger in a context where it is not allowed. This can happen in various scenarios, such as when debugging certain types of programs or transactions that do not support the classic debugger.
  Causes:
  
  Context Restrictions: The classic debugger may not be available in certain contexts, such as when debugging ABAP programs that are executed in a specific environment (e.g., background jobs, certain transaction types).
  Debugger Settings: The system may be configured to use the new debugger exclusively, and switching to the classic debugger is not permitted.
  Program Type: Some programs or function modules may not support the classic debugger due to their nature or the way they are executed.
  
  Solutions:
  
  Use the New Debugger: Instead of trying to switch to the classic debugger, continue using the new debugger, which