Cost and quantity properties
Two other mapping properties are labeled Cost and Quantity. These properties help control the way totals are rolled up through records organized in a hierarchy. These properties and the rolling up of totals in a hierarchy are described in "Hierarchies".
The Image property is used when defining the default fields displayed in a link.
The Conversion Group and Exchange Date properties are used to help convert between different currencies. These properties and currency conversion are described in "Money".
For any of the above properties the drop-down list next to the property allows you to select the field whose value will be used for the purposes described above. Notice that the Cost and Quantity properties only allow selection of Number fields; the Image property only allows selection of Image fields; the Conversion Group property, List fields; and the Exchange Date property, Date or Date/Time fields.