On the Terms / Pricing tab of a Customer account is 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 for this Customer..
• 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.
• Create customer Items when posting Invoice: When enabled, this option automatically creates Customer Items upon posting an invoice for the customer account, provided that the invoice includes a product with a defined Customer Item Type.