from odoo import api, fields, models

class MrpProduction(models.Model):
    _inherit = 'mrp.production'

    packaging_id = fields.Many2one('product.packaging', string='Packaging', domain="[('product_id', '=', product_id)]", check_company=True)
    packaging_qty = fields.Float('Quantity Packaging', default=0.0, digits='Product Unit of Measure')

    @api.onchange('packaging_id', 'packaging_qty')
    def _onchange_packaging_qty(self):
        if self.packaging_id and self.packaging_qty:
            self.product_qty = self.packaging_id.qty * self.packaging_qty