How To Fix TPDA661 - A terminal ID for outgoing requests could not be set.

TPDA661 - Overview

• Message type: E = Error

• Message class: TPDA - Debugger

• Message number: 661

• Message text: A terminal ID for outgoing requests could not be set.

What causes this issue?

No terminal ID could be determined for outgoing requests.
It is possible that you did not start the action that led to this
message in a SAP GUI window (e.g. Web GUI). Use SAP GUI for Windows,
since otherwise this function does not exist.
It is possible that you also have not yet set an external breakpoint
which is associated with a terminal ID. In the ABAP Workbench, select
the terminal ID activation for external bugging under:
Utilities -> Settings -> ABAP Editor -> Debugging
Breakpoints set after this will then be associated with this terminal
ID. It is then also possible to run any number of external sessions (SAP
GUI windows) in the same Windows logon automatically with this terminal
ID for outgoing requests (OK code: "/HTID").

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

Error message extract from SAP system. Copyright SAP SE.

TPDA661 - Details

• The SAP error message TPDA661 indicates that the system is unable to set a terminal ID for outgoing requests. This can occur in various scenarios, particularly when dealing with transport requests or when trying to communicate with other systems.
  Causes:
  
  Missing Configuration: The terminal ID may not be configured correctly in the system settings.
  Authorization Issues: The user or system may lack the necessary authorizations to set or use the terminal ID.
  Network Issues: There may be network connectivity problems that prevent the system from communicating with the required terminal or system.
  Transport Directory Issues: Problems with the transport directory or transport management system configuration can lead to this error.
  System Settings: Incorrect settings in the transport management system (TMS) or in the SAP system profile.
  
  Solutions:
  
  
  Check Configuration:
  
  Verify that the terminal ID is correctly configured in the SAP system. You can check this in the TMS configuration.
  Use transaction STMS to access the Transport Management System and ensure