PJT R12.1 How the burdened cost have been calculated in PJT

Hi

I know perfectly how the costs have been calculated in PJC, when you use a schedule for your burdened costs, but I don't see how PJT calculate a planified burdened cost, when you enter a planified qty ?

Where can I see the schedule which is used in the Project ? If I have a look on the Project template, I see the burdened schedule, but how can I be sure that it was not changed in the project.

And how PJT can calculate a burdened cost without a expense type  ?

Thanks for your answer !

Regards

Thierry