When accessing these tags on documents and emails that have access to orders, PreviousOrder can be added as a prefix to the tag or the previous order loop can be used.

{{PreviousOrder.TagName}}    or    <!--{{#each PreviousOrder}}-->{{TagName}}<!--{{/each}}-->

IdThe id of the previous order.Guid
InvoiceDateThe date set as the invoice date on the previous order.Date/Time
InvoiceTotalThe calculated total of previous order.
Decimal Value
NameThe name of the previous order.Text
NumberThe system generated number of the previous order.Whole Number
OrderDateThe date set as the order date on the previous order.Date/Time