The Stat Numbers Tab Page displays information about other documents that are associated with the selected sales order. This information includes the opportunity number of any Opportunity records associated with the order and the quote number that the order was created from.
The Stat Numbers Tab Page also displays the original invoice number and the RA number associated with the order (if any). These fields are loaded when the order is created from an existing invoice or from the Return Authorization system.
The right section of the Tab Page displays the last invoice number associated with the order (the last invoice that was created from the order), and the original and source sales order (if any) that the order was created from (this information is normally only loaded when you duplicate an existing order, or you create an order from a quote).