Here are the steps for you to input this transaction:
In the banking section create a new account called “Goodwill” under the cash accounts section:
This can act as a holding area for any credit notes you wish to carry forward from before you started using QuickFile.
Now return to the supplier detail screen and in the “More Options” menu and select the option “New Prepayment”.
Now in the dialogue box enter the credit amount and set the “paid from” account to “Goodwill”. You can also set the date to when the credit was issued.
Now when you later lodge a purchase invoice to this supplier you can use the credit to pay down that invoice.
Hope that helps, please let me know if I can be of further assistance.