Can you provide an idea about about invoice/vendor bills payments allocation . I am using odoo15 . In payments i added a one2many for list customers' not fully paid invoices/vendor bills . I need to allocate partial/ full payment when post payments .

Here is my code .

class AccountPayment(models.Model):
_inherit = "account.payment"

payment_line_ids = fields.One2many('account.payment.line', 'payment_id', string="Invoice Adjustment")

@api.onchange('partner_id')
def _onchange_partner_id(self):
    line_vals = []
    for rec in self:
        rec.payment_line_ids = False
        if rec.partner_id:
            partner_moves = self.env['account.move'].search([('partner_id', '=', rec.partner_id.id),('state', '=', 'posted'), ('payment_state', 'in',('not_paid','partial'))])

            for mov in partner_moves:
                open_invoice_lines = {
                    'move_id':mov.id,
                    'date':mov.date,
                    'date_due': mov.invoice_date_due,
                    'original_amount': mov.amount_total,
                    'balance_amount': mov.amount_residual,
                    'payment_id':rec.id,
                }
                line_vals.append((0, 0, open_invoice_lines))
        rec.payment_line_ids = line_vals

class AccountPaymentLine(models.Model):

_name = 'account.payment.line'

payment_id = fields.Many2one('account.payment')
move_id = fields.Many2one('account.move', string="Invoices/Bills")
date = fields.Date(string="Date")
date_due = fields.Date(string="Due Date")
original_amount = fields.Float(string="Original Amount")
balance_amount = fields.Float(string="Balance Amount")
allocation_amount = fields.Float(string="Allocation Amount")