Select Value package action is used for debugging.
Example
Select Value package action does not work when the agent is used for execution or in a separate thread
Workflow tab
The Write Variables option ensures that the “Package Action” logs the variable values into the “Action vars before log file” before the action is executed and logs the updated variable values into the “Action vars after log file” after the action completes.
It is usually used for debugging and not recommended for production environment.