Hi , I'm trying to increment a field by 1 , but it is incremented by 2. here is my code:

patient.py

Num_dossier = fields.Char('Numéro du dossier', required=True, readonly=True)

_defaults = {       

lambda self,cr,uid,context={}: self.pool.get('ir.sequence').get(cr, uid, 'numero.dossier'),         

}

my_sequence.xml

<record model="ir.sequence.type" id="seq_type_patient">           

    <field name="name">patient_sequence</field>           

    <field name="code">numero.dossier</field>       

</record>       

<record id="seq_patient" model="ir.sequence">           

    <field name="name">patient</field>            

    <field name="code">numero.dossier</field>                        

    <field name="number_increment">1</field>       

</record>