Hi there: In the Purchases window, go to that vendor and prepare a negative invoice for the $14.92 and put it to an account called Discounts Taken. If you do not have that account in your Chart of Accounts, probably in the Revenue section, then create one first before you create the invoice.  The entry should be a debit to Accounts Payable and a credit to the Discounts Taken account.  That will "clear" the amount from the Vendor's account and it will no longer show as owing.

In the future, when you go to the Payments window to pay an invoice to a vendor, there is a column where you can type in the amount of the discount taken and then pay the "net" in the cheque.  It should completely clear the invoice at the time of payment by crediting the discount taken amount to that account.   Hope this helps.  Rita Deering