Actual Invoice against Down Payment

Hi Expert,

I have an issue where business raised an AP invoice with special G/L indicator 'U' as downpayment. Then business cleared the invoice/downpayment via F110. Then business raised an actual invoice, how to knock off the value in the actual invoice against the downpayment as the downpayment already cleared?

Kindly help to advice.

Thank you.

Regards,

Izzat