How To Import Prepayment Invoice with Prepayment PO Number Item via Payables Open Interface

Hi All,

If the prepayment has a value in the Prepayment PO Number field,
then the invoice must be matched to the same purchase order.
I need this functionality .

My question

1.How To Import Prepayment Invoice with Prepayment PO Number Item via  Payables Open Interface?
2.Which one column is used for  Prepayment PO Number in AP_INVOICES_INTERFACE ?

Thank you
Michelle