Supplier Invoice Don't Have Project and Task details for Inventory PO

Hi,

in R12.1.3 release I would like to know why the Project and Task details are not populated in the supplier invoice of a Inventory PO. I have the below scenario.

- Inventory PO amount 100 USD (Our funtional currency is GBP)is raised for Project A and Task B

- Cost 100 USD is transferred to Project A and Task B from Inventory (Transaction Source = Inventory) through the Project Cost Transfers process after goods are received in the inventory

- Now the AP invoice corresponding to this PO doesn't have the Project or Task details. Why this is the case for Inventory PO?

- Now if there is a exchange rate variance in the supplier invoice then how the exchange rate variance cost will go to Project A and Task B unless the project and other details are there in the invoice distribution ?