The patient ID
OK
Whether this item is marked for billing (should appear on invoice). User-controlled toggle for samples, comped items, etc.
Whether this item has already been added to an invoice (InvoiceLineItem exists).
Type of dispense: InHouse (administered now) or Prescription (take-home).
The appointment this dispense is tied to, if any. Null for walk-in/OTC dispenses made outside an appointment context.