We use OOB Alternative product replacement for our sales orders in D365 F&O when an item is replaced by another or when an item is out of stock and an alternative item can be used.

In standard D365 F&O, the system replace the original item on the sale order line based on the “When to use” alternative item defined on the released product. (Settings as per Product Information Management -> Released Product -> Sales Orders -> Alternative Product)

However, when the Ecommerce order gets created, the system doesn’t replace the original item based on the setup “When to use” alternative item functionality.

We would like to see that logic also be used for ECommerce.