Not necessarily. The invoice makes demand for payment according to the terms of sale. @letap said in post #1, “… it has been sold out ….” If the goods have been sold, an invoice can be appropriate, whether the goods have been delivered or not. My original comment was based on that statement.
@letap’s more recent posts suggest that perhaps the goods described have not really been sold. That is a different situation and goes back to the notion of sales orders obligating inventory. That has been in the Ideas category for almost two years. See Finding items that are on sales orders.