I have three models wtm.trip, wtm.invoicelist, and wt.invoice

I want to select an invoice from wt.invoice in wtm.invoicelist and update its loading status such as fully loaded or partially loaded.

So, an invoice which is selected as fully loaded can't be selected in another wtm.trip record or this trip more than once.

how should I proceed to solve this problem?

class trip(models.Model):

	​_name="wtm.trip"

	​trip_number= fields.Char(readonly=True)

	​vehicle_id= fields.Many2one('wtm.vehicle', required=True)

	​vehicle_vendor= fields.Many2one(related='vehicle_id.vendor_id')

	​​invoice_line_ids= fields.One2many('wtm.invoicelist', 'invoiceline_id')


class invoicelist(models.Model):
	​_name="wtm.invoicelist"

	​invoiceline_id= fields.Many2one('wtm.trip', string='Invoice Number')
	​invoice_id= fields.Many2one('wtm.invoice',string="Invoice Number")
	​invoice_date= fields.Datetime(related='info_id.invoice_date',readonly=True)​
	​loading_status= fields.Selection([('full','Fully Loaded'),('partial','Partially Loaded')], default='full')user_name= fields.Many2one('res.users',readonly=True, default=lambdaself: self.env.user)num_of_carton= fields.Char(related='info_id.number_of_carton')


class invoice(models.Model):
	​_name="wtm.invoice"

	​invoice_number= fields.Char()
	​invoice_date= fields.Datetime()
	​invoice_value= fields.Float()