When I try to get a Purchase Analysis report in Suppliers for last 12 months and in dollars, it does not capture ALL the suppliers who have supplied us during the year.
This is because the Analysis reports are split into sections, please see the screen shot below.
The first nine reports include Supplier transactions from both Purchase Orders and from Supplier no Products transactions.
The last four reports only use transactions that have been created from the purchase order screen.
To see all Suppliers, use one of the top reports.