A. To allocate a receipt against an invoice go to Sales –> Money Collected, this will give you a list of invoices and receipts that are outstanding.
There is a checkbox beside each transaction, in the case of the invoice and receipt suggested, select the invoice then select the receipt. In the blue section below, select the appropriate bank account and set the date to the receipt date, as this receipt has been reconciled in the bank.
When you are done your screen should look like the screen below. Click on the Save/Allocate button to complete. If you want to amend or delete an allocation, follow these steps.