I have been trying to setup additional functionality to the mobile app but one function keeps throwing a “Server Error (404)” message.  (Yes, I know that 404 is page not found).
Even the example in the only documentation I have fails. (Documentation example for invoices from “2019 R1”.

Basically all I am trying to do is after displaying the list of Shipments, then tap on that shipment to change or edit it.  But the error occurs whenever I add the command of 

    add containerAction "editDetail" {
      behavior = Open
      redirect = True
    }

Why does that generate that 404 error message?  And how do I correct that with 2020 R2?