The Process Step Choice window is a functionality that is used within the
Process Structure Diagram (PSD).
When making a Process Structure Diagram you connect the proces step kind of a specific transaction kind to another proces step king of a different transaction kind. With the call link you connect the initiation of the next transaction kind. With the wait link you add the waiting condition to the specific step kind.
Adding these rules is supported by this window:
This window allows you to easily make call and wait links between transaction kinds in the PSD. Below are gif’s demonstrating the functionality of this window.