Hello,

 I have a model like this:

class MyClass(models.Model):
    _name = 'my.class'

    product_id = fields.Many2one(string='Product', comodel_name='product.product')
    picking_id = fields.Many2one(string='Picking', comodel_name='stock.picking')

    @onchange('product_id')
    def _change_product(self):
        return {'domain': {'product_id': [('id', 'in', [ml.id for ml in self.picking_id.move_lines])] if self.picking_id else []}}

This works fine, after changing the product_id of the mMyClass instance. However I would like to have a pre-load correct domain and I don't know how to do it.

Thanks in advance.

Boris