How and when the Inventory Cost Account and Billing and Inven Cost Clearing Account generated?

Hi,

I use Project Costing and Project Billing. I have to collect cost from Inventory issue to project and Supplier invoice charge to project. The Inventory issue account is entered manually in Oracle Inventory and there is no accounting created in Oracle Project Costing.

In AutoAccounting, there is function name 'Inventory Cost Account', 'Invent. Cost Clearing Account', and 'Inventory Revenue Account'. I want to know how and when the system generated these account? Is it effect to my situation?

Regards,

Pimporn