_inherit ='res.partner'
kota_id = fields.Many2one(comodel_name='aris_kota.kota', string='Kota / Kab.', domain="[('state_id', '=', state_id)]")
    
@api.onchange('kota_id')
def_onchange_kota_id(self):        
    if self.kota_id:            
        self.city =self.kota_id.name                
        kecamatan_id = fields.Many2one(comodel_name='aris_kota.kecamatan',string='Kecamatan', domain="[('kota_id', '=', kota_id)]")
    
@api.model    
def_address_fields(self): 
    """Returns the list of address fields that are synced from the parent.""" 
    return list(ADDRESS_FIELDS)
    
@api.model    
def_formatting_address_fields(self):
    """Returns the list of address fields usable to format addresses.""" 
    return self._address_fields()    


class PaymentTransaction(models.Model):    
    _inherit ='payment.transaction'

    
    @api.model_create_multi    
    def create(self, values_list): 

class Partner(models.Model):

kecamatancoba = self._getkecamatan() # i get the error here, the message is =>  "We are not able to process your payment. 'payment.transaction' object has no attribute '_getkecamatan' "

How To get and use kecamatan_id.name value in class PaymentTransaction from class partner ?