The payment term in the item is ignored in sales orders and Invoices from AR

Summary:

The Payment terms attribute in the Item specifications is not taking it into an AR invoice

Content:

On an AR invoice, when the item is added with the payment term defined in its specifications, the invoice ignores it and the payment term field remains empty on the invoice

What function does the payment terms from the item serve if it apparently is not a default value in AR invoices?

Regards.