How To Fix TPDA159 - This action is not possible here (for example, in a conversion exit).

SAP Error Message - Details

• Message type: E = Error

• Message class: TPDA - Debugger

• Message number: 159

• Message text: This action is not possible here (for example, in a conversion exit).

What causes this issue?

This action in the debugger is not always possible.
In some situations ABAP is called directly from the kernel, for example
with a conversion exit (function modules CONVERSION_EXIT_*_OUTPUT or
CONVERSION_EXIT_*_INPUT).
You can recognize this situation if a direct call for the relevant entry
cannot be identified in the ABAP stack (for example, the ABAP stack
shows that a function module CONVERSION_EXIT_*_OUTPUT is called from a
WRITE statement).
If there is one of these entries on the ABAP stack, this action cannot
be used here.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TPDA159 - This action is not possible here (for example, in a conversion exit). ?

  The SAP error message TPDA159, which states "This action is not possible here (for example, in a conversion exit)," typically occurs when a certain operation or function is attempted in a context where it is not allowed. This can happen in various scenarios, such as when using conversion exits, field exits, or certain function modules that are not permitted in specific contexts.
  Cause:
  
  Context Restriction: The error usually arises when a function or method is called in a context where it is not applicable. For example, trying to perform a certain operation in a conversion exit where it is not allowed.
  Invalid Data Handling: Attempting to manipulate data in a way that is not supported by the current processing logic or data type.
  Incorrect Function Usage: Using a function or method that is not designed to be used in the current context, such as trying to access database records or perform calculations in a conversion exit.
  
  Solution:
  
  Review the Code: Check the code where the error occurs. Ensure that the function or method being called is appropriate for the context. If it is a conversion exit, ensure that it only contains logic that is valid for that context.
  Use Alternative Methods: If the operation you are trying to perform is not allowed, consider using alternative methods or approaches that are valid in the given context.
  Debugging: Use debugging tools to trace the execution flow and identify the exact point where the error occurs. This can help in understanding why the operation is not permitted.
  Consult Documentation: Refer to SAP documentation or help resources for the specific function or method you are using to understand its limitations and proper usage.
  Error Handling: Implement error handling to manage situations where operations are not allowed, providing meaningful feedback to users or logging the issue for further analysis.
  
  Related Information:
  
  Conversion Exits: These are special routines in SAP that convert data from one format to another, typically used in field definitions. They have specific rules and limitations on what can be done within them.
  Function Modules: Some function modules are designed to be used in specific contexts. Always check the documentation for the function module to ensure it is being used correctly.
  SAP Notes: Check SAP Notes for any known issues or updates related to the error message TPDA159. SAP frequently releases notes that address specific errors or provide guidance on best practices.
  
  If the issue persists after following these steps, consider reaching out to SAP support or consulting with an experienced SAP developer for further assistance.