Hi,

For creating dynamic domain , please check the below code.

class SaleOrder(models.Model):

    _inherit = 'sale.order'

    sale_order_cashback = fields.Boolean(string="Cashback order")

    cashback_products = fields.Json()

@api.onchange('sale_order_cashback')

    def _onchange_sale_order_cashback(self):

        query = """

            SELECT pp.id

            FROM product_product pp

            INNER JOIN product_template pt ON pp.product_tmpl_id = pt.id

            WHERE pt.sale_ok = true

        """

        if self.sale_order_cashback:

            query += " AND pt.available_for_cashback = true"

        self.env.cr.execute(query)

        product_ids = [row[0] for row in self.env.cr.fetchall()]

        self.cashback_products = product_ids

XML

<record id="sale_order_form" model="ir.ui.view">

        <field name="name">sale.view.order.form.inherit</field>

        <field name="model">sale.order</field>

        <field name="inherit_id" ref="sale.view_order_form"/>

        <field name="arch" type="xml">

         <xpath expr="//field[@name='order_line']//tree//field[@name='product_id']"

                       position="attributes">

                    <attribute name="domain">[('id', 'in', parent.cashback_products)]</attribute>

          </xpath>

</field>

</record>

Hope it helps