Hello guys, 

please i have an attributeError that i don't understan. In fact, i have declared the fields i need in my .py but when executing it says to me " AttributeError: Field `motif` does not exist "
My .py looks like this : 

class wizard(models.TransientModel):

    _inherit = "al.validfr.wizard", "al.novalidfr.wizard", "al.agency", "al.ouv.fr"

    _name = "bi.wizard.caisse"

    montant = fields.Integer(string="Mont", help="montant de C")

    motif = fields.Selection([

             ('Ch.Eau', 'water'),

             ('Ch.Electricité', 'Electricity'),

             ('Ch.dép', 'Déplacement'),

             ], help="les charges")

    state = fields.Selection([

             ('active', "Ouverte"),

            ('closed', "Fermée")

            ], default='active')

My View file looks like this : 

<record id="view_charges_tree" model="ir.ui.view">

     <field name="name">charges.tree</field>

    <field name="model">bi.wizard.caisse</field>

    <field name="arch" type="xml">

         <tree string="Les charges par agence">

             <field name="name"/>

             <field name="motif"/>

             <field name="montant"/>

             <field name="state"/>

         </tree>

    </field>

</record>

Thanks in advance.