For a cost (such as an item, expense, or time entry) to be made available for invoicing to a customer, two key pieces of information must be recorded on the source transaction line (e.g., a Vendor Bill or Expense Report). First, the billable checkbox must be marked to flag the item as intended for pass-through billing. Second, a customer (or customer project) must be selected to associate the billable cost with the specific entity that will be invoiced. Without both of these settings, the charge will not appear in the customer's billing queue.

C. invoice number: The invoice number is generated upon the creation and saving of the invoice itself; it is a result of the billing process, not a prerequisite for adding items to it.

D. memo: The memo field is used for descriptive text or internal notes. While useful for clarification, it is not a functional field that controls whether an item is billable or appears on an invoice.

1. Oracle NetSuite Help Center

SuiteAnswers. "Marking Expenses as Billable." Document ID: 10095. This guide explicitly states the procedure: "On an expense line

check the Billable box. In the Customer column

select the customer you are billing for this expense." This confirms both the "billable checkbox" and "customer" are required.

2. Oracle NetSuite Help Center

SuiteAnswers. "Billing Costs to Customers." Document ID: 9949. This document outlines the feature and notes: "To bill costs back to customers

you must associate the costs with customer projects on purchase transactions. When you enter a purchase...you can mark line-item costs as billable to a specific customer."

3. Oracle NetSuite Help Center

SuiteAnswers. "Entering a Billable Expense on a Vendor Bill." Document ID: 8521. The step-by-step instructions include: "3. Check the Billable box for the expense line. 4. Select the Customer:Job the expense is for." This further reinforces that both settings are mandatory for the process.