1.5 Sales History
Clicking on the ‘Sales History’ link on the Customer Details page will
bring you to a summary of past purchases made by the customer. It also will
show previous returns by the customer.

You will see the page as shown by the screenshot below.

The Search Toolbar on the top of the page allows you to narrow down your
search to specific dates. The ‘History Type’ option allows you to search for
past purchases (invoices) and past returns (credit notes) related to this
customer.
This summary page allows you to analyse previous purchases and returns
by the customer, allowing you to determine which products are more active. It
also details the last ordered date and days since the last order, allowing
sales person to determine that a potential need for a new order might arise.