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請求書の日付を変更する際に期日を計算しようとしていますが、機能していません。

    raise osv.except_osv(_('OnChangeDateInvoice'), _('Start'))

    if date_invoice != time.strftime('%Y-%m-%d'):
        if not payment_term_id:
            return {'value':{'date_due': date_invoice}}
        pterm_list = self.pool.get('account.payment.term').compute(cr, uid, payment_term_id, value=1, date_ref=date_invoice)

        if payment_term != partner_payment_term:
           if partner_payment_term:
               to_update = self.onchange_payment_term_date_invoice(
                  cr, uid, ids, partner_payment_term, date_invoice)
               result['value'].update(to_update['value'])

               if pterm_list:
                   pterm_list = [line[0] for line in pterm_list]
                   pterm_list.sort()
                   result = {'value':{'date_due': pterm_list[-1]}}
        else:
               result['value']['date_due'] = False

    raise osv.except_osv(_('OnChangeDateInvoice'), _('End'))
    return result
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