I'm trying t​o create a product bundle(creating a list of products inside a product) using one2many-many2one relation,
 everything works fine no compiling errors while running the server but in product form view when i add a 
new product
  in the list an error pops:


ValueError: Wrong value for product.template.type: 'product'

here is my 2 models:
class Product(models.Model):

	_inherit = 'product.template'

	puissance = fields.Integer(string='Puissance(W)')
	categ_name = fields.Char(string ='category name',related='categ_id.name')
	is_bundled = fields.Boolean(string='Est un ensemble de produits',default=False)
	product_ids = fields.One2many('product.bundle', 'ref_id', string="Ensemble Produits")

class Bundle(models.Model):
	
	_name="product.bundle"
	_description="adds products bundle "

	ref_id = fields.Many2one('product.template',string='Nom article', domain=[('sale_ok', '=', True)])
	qty = fields.Integer('Quantité', default=1)
        price_unit = fields.Float('Prix unitaire', related='ref_id.list_price')
	remise = fields.Integer('Remise %')
	price_htva = fields.Float('Prix TT HTVA', compute='_calcul_prix') 

        @api.depends('qty', 'price_unit', 'remise')
	def _calcul_prix(self):
		for rec in self:
	 		rec.price_htva = (qty*price_unit) - (((qty*price_unit)*remise)/100)