The following image shows the Parameter Fields category expanded to show the fields that have been included in the report example used elsewhere in this guide. The exchangeRate parameter has been selected and is subsequently displayed in the Script Code sheet.
Parameter fields are designated by the question mark (?) prefix and the brace symbols (that is, the { and } symbols, sometimes known as curly brackets) that enclose them, as shown in the example.
{?performance bonus}
For details about creating and using parameter fields, see "Using the Param Sheet", under "Using the Catalog of Available Fields Dialog", in Chapter 4.