Final answer:
In an E-R diagram for an Order Entry/Sales system, SALES_INVOICES are typically generated by the SHIPMENTS entity, reflecting standard sales practices of invoicing at the point of shipment.
Step-by-step explanation:
In the context of an E-R diagram (Entity-Relationship diagram) for an Order Entry/Sales (OE/S) system, the entity that generates SALES_INVOICES is typically the SHIPMENTS entity. This is because once an order has been processed and the goods have been shipped to the customer, the shipment information is used to generate a sales invoice which outlines the details of the transaction including the products shipped, quantities, prices, taxes, and total amount due. The process of generating invoices based on shipments aligns with standard accounting and sales practices, where an invoice is recorded at the point of shipment/delivery of goods or services.