Is there a law in Italy that you must deduct Payment Discount from Invoices?

Basically treat it like a line discount or invoice discount and show the discounted amount on the invoices?

My colleague says we must either add the Payment Discount as a Line Discount and if the customer pays too late then invoice it separately, or alternatively, every time a customer paid with Payment Discount send a credit note.

I have checked the localised database and it does not automatically deduct the payment discount from invoices, so what is the best way to handle it?

Hi. Sorry for being so late. Did you find a solution to your problems?