you can use the @api.onchange decorator to trigger a method that updates the total_amount field.

from odoo import api, fields, models


class SyndicPaiement(models.Model):
    _name = "syndic.paiement"

    total_amount = fields.Float(string='Total Amount', compute="_compute_montant_total")
    received_amount = fields.Float(string='Received Amount')

    @api.depends('received_amount')
    def _compute_montant_total(self):
        for record in self:
            record.total_amount = sum(record.received_amount for record in self)

    @api.onchange('received_amount')
    def _onchange_received_amount(self):
        self._compute_montant_total()

In this example, we define the total_amount field as a computed field with the compute attribute set to _compute_montant_total. The _compute_montant_total method sums up the received_amount values for all records in the current set.

The @api.onchange('received_amount') decorator is used for the received_amount field. Whenever the received_amount field is changed, the _onchange_received_amount method is triggered, which in turn calls the _compute_montant_total method to update the total_amount field.

Hi,

Please try this way,

@api.depends('received_amount')
def _compute_montant_total(self):
	​for record in self:
	​	​record.total_amount += record.received_amount

Thanks