Hi,

Seems you need to apply domain to a field based on another field, if you are using odoo 13 and below, you can follow the approach of returning domain from the onchange function.

See:- How To Give Domain For A Field Based On Another Field

If you are using odoo 14, the above method get deprecated. So you can follow the below procedure using a third party module from OCA.

Module: Web Domain Field

How to use?

   <field name="product_id_domain" invisible="1"/>
   <field name="product_id" domain="product_id_domain"/>

The field used as domain must provide the domain as a JSON encoded string.

   product_id_domain = fields.Char(
       compute="_compute_product_id_domain",
       readonly=True,
       store=False,
   )

   @api.multi
   @api.depends('name')
   def _compute_product_id_domain(self):
       for rec in self:
           rec.product_id_domain = json.dumps(
               [('type', '=', 'product'), ('name', 'like', rec.name)]
           )

Thanks