amount is the numerical value paid for the item (e.g. 10.99) but must not include a currency symbol (as this is defined by the currency field) or commas (a single full stop is used to separate the 'pounds' and the 'pence' or equivalent). Although optional, to ensure that each amount has the correct currency, we recommend that currency is defined for each order line in the sales file where an amount is defined.

If the customer is being asked to review more than one product on a single feedback form, the order of the listed products will be determined by the amount field, the most expensive being at the top and the least expensive at the bottom.