The great advantage of an integrated management system is that you can plan!

In the case of a sale of, for example, 11 units of a product where only 10 are in stock, the forecast link gives the complet information about how many could be delivered immediately, as all related transfers/reserves/priorities and with the right settings, is the perfect tool for planning delivery dates and their quantities.

But for the point of sale module?

If you are using Odoo to sell online