Prepayment functionality missing in AR_INVOICE_API_PUB

Hi,

We plan to use the AR_INVOICE_API_PUB to create invoices, but found that it has no fields to support prepayment. Found that  autoinvoice (ra_interface_lines_all) works through payment_set_id and populates prepayment_flag on invoice header and payment_set_id on line. ra_interface_lines_all has a payment_set_id column.

But AR_INVOICE_API_PUB does not have any payment_set_id field.

Question: How to use prepayment functionality when using AR_INVOICE_API_PUB ?

Thanks, Søren