Hi Moe,

By default, in Odoo, when you create a backorder for a delivery order, the scheduled date of the backorder will be the same as the original order's scheduled date. However, if you want the scheduled date field to be blank by default for backorders, you would need to customize this behavior through a custom module or a code modification.

Hope it will be helpful to you.

Thanks & Regards,
Email: odoo@aktivsoftware.com  

Skype: kalpeshmaheshwari