How to create automatic receipts at transaction line level in AR?

Hi,

The standard Automatic receipts functionality in AR allow us to automatically create and apply receipts to the invoice (full amount). We then create a remittance batch and in R12 we have to create a settlement batch to send to the bank to have the funds transfer to our bank account.

This process meets our requirement except that instead of creating a receipt for invoice amount, we would like to create receipt and apply only to certain lines of an invoice. I can't find anything to indicate that the standard  Automatic receipts does not support the line level receipt creation and application. Is this right? If Yes, would it be possible to do this using seeded Receipts API available? Which Receipts API?