Hello,

This is my model :

class miadi_poidsConditionnement(models.Model):

 _name = 'miadi.poidsconditionnement'

 # _order = 'conditionnement_id asc'

 conditionnement_id = fields.Many2one('miadi.packaging', 'Packaging', default='', required=True)

 produit_id = fields.Many2one('product.product', 'Product', default='', required=True)

 nb_articles = fields.Integer(string='Number of products', default=0)

 poids = fields.Float(string='Packaging Weight', default=0)

 _sql_constraints = [

 ('uniq_id', 'unique(produit_id, conditionnement_id)', 'A product already exists with this packaging !'),

 ]

But my SQL constraints don't work ! I can create 2 records with the same "conditionnement_id" and "produit_id" but I shouldn't be able to do it.