Hi,

Try the following code

from odoo import models, fields, api

class XCost(models.Model):

    _name = 'x.cost'

    _description = 'X Cost'

    total_cost = fields.Float(string='Total Cost')

    quantity = fields.Float(string='Quantity')

    u_cost = fields.Float(string='My Cost', compute='_ucost_calc', store=True)

    product_id = fields.Many2one('product.template', string='Product')

    @api.depends('total_cost', 'quantity')

    def _ucost_calc(self):

        for a in self:

            if a.quantity != 0:

                a.u_cost = a.total_cost / a.quantity

                # Assuming there's a Many2one field linking to the product template, e.g., product_id

                if a.product_id:

                    a.product_id.cost_price = a.u_cost

            else:

                a.u_cost = 0.0

Hope it helps