@type t() :: %HL7v2.Segment.INV{
  available_quantity: term(),
  consumption_quantity: term(),
  container_carrier_identifier: term(),
  current_quantity: term(),
  expiration_date_time: term(),
  extra_fields: term(),
  first_used_date_time: term(),
  initial_quantity: term(),
  inventory_container_identifier: term(),
  manufacturer_identifier: term(),
  manufacturer_lot_number: term(),
  on_board_stability_duration: term(),
  on_board_stability_time: term(),
  on_board_stability_time_2: term(),
  position_on_carrier: term(),
  quantity_units: term(),
  substance_identifier: term(),
  substance_status: term(),
  substance_type: term(),
  supplier_identifier: term(),
  test_fluid_identifier: term()
}