I  have an One2many field on a model and I wanna read the same values from another model. I tried adding a Many2one relation to it but it seems to not read data. Can someone please help me?

the way I have defined one2many:

class OnetoMany(models.Model):
    _name = "kestet.lines"

    partner_id = fields.Many2one("res.partner")
    kestet = fields.Char(string="Emri i Kestit(n)")
    vlera = fields.Integer(string="Vlera e Kestit(n)")
    data = fields.Date()
    sel1 = fields.Selection(
        [('kontrate', 'Kontrate'), ('levrim', 'Levrim Kredie'), ('karabina', 'Karabina'), ('hipoteka', 'Hipoteka'),
         ('Celsat', 'Celsat'), ('Ne Perfundim', 'Ne Perfundim'),
         ('other', 'Tjeter')], string="Menyra Likujdimit")

    pagesa1 = fields.Selection([('Cash', 'Cash'), ('Bank', 'Bank'), ('Klering', 'Klering')], string="Menyra Pageses")
    product_template_id = fields.Many2one("product.template")
    property_contract_id = fields.Many2one("property.contract")

class ProductTemplate(models.Model):
    _inherit = "product.template"

    
     kestet_ids = fields.One2many('kestet.lines', 'product_template_id', string="Kestet", store=True)

property.contract(where I need it the most):

class PropertyContract(models.Model):
    _name = "property.contract"
    _order = 'start_date'

     kestet2_id = fields.Many2one('kestet.lines')

everytime it gives me 0 when I do kestet2_id.vlera