Hi, i'm trying to make products packs, so I made a boolean button in the product to check if the product is a pack, now i want to make an onchange to change the type of the prodcut to service if pack checkbox is true. I'm trying with this but is not working.

class product_template(models.Model):
    _inherit = 'product.template'
    pack = fields.Boolean('Pack?')

 api.onchange('pack')
 def _onchange_pack(self):
     if self.pack: 
         self.type = 'service'