On the Terms / Pricing tab of a Customer account are a number of additional slider options, these turn blue when activated.
Require an order number on quotes and invoices: If selected, to post an invoice will require an order number to be supplied by the Customer.
International customer (GST Exempt): Accounts activated for this will have no GST calculated on Invoices and Quotes created for them.
Send Statements: Deselecting this option excludes the Customer from statement runs.
Accepts backorders: Enables the backorder option on Customer Invoices.
Allow discount matrix pricing: This option allows discount matrix pricing to be activated / deactivated at the Customer level.
Include pricing on packing slips: If the standard packing slip option is selected, this will Include the pricing on the packing slip for this customer.