Odoo 12 Confirmation form (confirm/ discard) from Wizard - wizard

Question

I created a wizard in account.invoice form who is displayed when user click on "confirm bill".
This wizard contain two buttons: discard and confirm.
When user click on confirm button the bill is created.
How to save fields of the "account.invoice" view from the confirm button of the wizard?
I hope you can help me.
this is the confirm function of the wizard:
#api.multi
def action_invoice_validation(self):
invoice = self.env['account.invoice'].search([('id', '=', self._context['parent_obj'])])
to_open_invoices = self.filtered(lambda inv: invoice.state != 'open')
to_open_invoices.action_move_creation()
return to_open_invoices.invoice_validation()
Below the two functions called in my principal function
action_move_creation function:
#api.multi
def action_move_creation(self):
""" Creates invoice related analytics and financial move lines """
account_move = self.env['account.move'].search([('id', '=', self._context['parent_obj'])])
for inv in self:
if not inv.date_invoice:
inv.write({'date_invoice': fields.Date.context_today(self)})
if not inv.date_due:
inv.write({'date_due': inv.date_invoice})
company_currency = inv.company_id.currency_id
# create move lines (one per invoice line + eventual taxes and analytic lines)
iml = inv.invoice_line_move_line_get()
iml += inv.tax_line_move_line_get()
diff_currency = inv.currency_id != company_currency
# create one move line for the total and possibly adjust the other lines amount
total, total_currency, iml = inv.compute_invoice_totals(company_currency, iml)
name = inv.name or ''
if inv.payment_term_id:
totlines = \
inv.payment_term_id.with_context(currency_id=company_currency.id).compute(total, inv.date_invoice)[
0]
res_amount_currency = total_currency
for i, t in enumerate(totlines):
if inv.currency_id != company_currency:
amount_currency = company_currency._convert(t[1], inv.currency_id, inv.company_id,
inv._get_currency_rate_date() or fields.Date.today())
else:
amount_currency = False
# last line: add the diff
res_amount_currency -= amount_currency or 0
if i + 1 == len(totlines):
amount_currency += res_amount_currency
iml.append({
'type': 'dest',
'name': name,
'price': t[1],
'account_id': inv.account_id.id,
'date_maturity': t[0],
'amount_currency': diff_currency and amount_currency,
'currency_id': diff_currency and inv.currency_id.id,
'invoice_id': inv.id
})
else:
iml.append({
'type': 'dest',
'name': name,
'price': total,
'account_id': inv.account_id.id,
'date_maturity': inv.date_due,
'amount_currency': diff_currency and total_currency,
'currency_id': diff_currency and inv.currency_id.id,
'invoice_id': inv.id
})
part = self.env['res.partner']._find_accounting_partner(inv.partner_id)
line = [(0, 0, self.line_get_convert(l, part.id)) for l in iml]
line = inv.group_lines(iml, line)
line = inv.finalize_invoice_move_lines(line)
date = inv.date or inv.date_invoice
move_vals = {
'ref': inv.reference,
'line_ids': line,
'journal_id': inv.journal_id.id,
'date': date,
'narration': inv.comment,
}
move = account_move.create(move_vals)
# Pass invoice in method post: used if you want to get the same
# account move reference when creating the same invoice after a cancelled one:
move.post(invoice=inv)
# make the invoice point to that move
vals = {
'move_id': move.id,
'date': date,
'move_name': move.name,
}
inv.write(vals)
return True
my invoice_validation function:
#api.multi
def invoice_validation(self):
invoice = self.env['account.invoice'].search([('id', '=', self._context['parent_obj'])])
for invoice in self.filtered(lambda p: invoice.partner_id not in invoice.message_partner_ids):
invoice.message_subscribe([invoice.partner_id.id])
# Auto-compute reference, if not already existing and if configured on company
if not create_uidinvoice.reference and invoice.type == 'out_invoice':
invoice.reference = invoice._get_computed_reference()
# DO NOT FORWARD-PORT.
# The reference is copied after the move creation because we need the move to get the invoice number but
# we need the invoice number to get the reference.
invoice.move_id.ref = invoice.reference
self._check_duplicate_supplier_reference()
return self.write({'state': 'open'})