Dear All, 

for one of the bigger projects our company agreed with a customer a partial advance payment which should be settled the following way:

from each invoice issued for delivered goods 70% of the invoice value should be settled with the advance payment which the customer transfered at the beginning of the contract (1 big transfer) and 30% should be paid within 30 days after the invoice date (all the invoices should be issued this way till the whole amount of the advance payment is settled). 

As we received the payment from our customer we issued a prepayment based invoice connected to the customer’s order.

Now when we issue an invoice for delivered goods, IFS automatically generates an invoice which is 100% settled with the prepayment.

We have no option to delete the invoice line with prepayment settlement (a pop-up with information “invoice lines for a debit invoice cannot be removed”), neither an option to modify the value in this line (so only smaller value would be settled with the invoice). 

Do you have any idea how to settle only a part of the invoice with a prepayment (and leave the other part with normal deferred payment)?