Hi,

The Invoice what is ordered rule is used as the default mode in Odoo Sales, which means that customers will be invoiced once the sales order is confirmed.

The Invoice what is delivered rule will invoice customers once the delivery is done. 
You can watch our below youtube video for more reference.

https://www.youtube.com/watch?v=J-7gGUdO_NM

And also please refer to our blog:

https://www.cybrosys.com/blog/an-overview-of-invoicing-policies-in-odoo-17-sales

Hope it helps

Hi,
If you set invoicing policy as Delivered Quantity for a product and create a sale order for this product, once the sale order is confirmed, you cannot create the invoice without delivering the product to customer. IE, we can only invoice, what is delivered to the customer.

For example, if you have SO with P1 as 10 qty and you made delivery for 4 qty's, at the moment you can create invoice for 4 qty, similarly depending on the delivered qty, you can create invoice.

If the Invoicing policy is set as Ordered Quantity, without looking at the delivered qty, you can create the invoice as per need for needed qty.


Thanks