Declining Payment Discounts

In Navision vers 4.0 I have setup Payment Discounts within Payment Terms whereby a Customer will get a 10% discount if they pay the invoice within 15 days. However what if a customer sends a cheque for the full amount excluding the discount that they entitled to. Is there anyway within Standard Navision when entering the Cash Receipts Journal and setting the Applies ID (F9) to decline the discount even though they are entitled to it. I could just overtype the discounted amount with the full amount but then the Customer card shows them as being in credit which my client does not want. Can anyone help please.

If there are not too many, you can manually change the Payment Disc. Possible or Date in the Customer Ledger.

Thanks Chris, thats what I did in the end although it took me sometime to figure it out. Thanks for help…Paul