Write off expense account - Autoaccounting

Hi,

The manual says:

Writing off an invoice creates a crediting invoice against the original invoice for the write-off amount you request. When you write off an invoice, Oracle Projects reverses the invoice amount from the unbilled receivables account and places it into a write off expense account when you interface the write off to AR.

Which is the function to setup the write off expense account in the Projects Autoaccounting?

Thanks