To add a gift voucher purchase to a debtor’s account,  

Recommended procedure for adding a gift voucher is to add a new line in the Line Items Tab of the Debtor record. Set the ‘Category’ field to ‘Payment’. Enter the amount in the ‘Amount’ field as a negative number. Leave the ‘Date Billed’ field empty; this will cause the line item to be automatically added to the next invoice produced for the debtor. 

Then, in the Payments Tab, add further details to the line item. Enter a date in the ‘Date Paid’ field. Change the ‘Amount’ field to the amount paid as a positive number. The ‘Method’ field and ‘Notes’ field may also be set as required. 

The payment has now been applied to the debtors account balance, and is set to automatically appear on the next invoice produced.