[FIX] l10n_it_edi_*: ImportoTotaleDocumento must include ReverseCharge taxes

In the XML, on the field holds the untaxed amount but it should have the taxed amount.
The field inside the xml correctly takes the total amount of the
invoice, but on the invoice in Odoo when using a RC tax, the tax amount
is 0 in Odoo, so the total amount will be as it is untaxed on the XML.
That's because the repartition lines are +100%/-100% distributed, but in
the self-invoice they must be exported as +100%, so we re-add them to
the total.

Task link: https://www.odoo.com/web#id=2936967&model=project.task
opw-2936967

closes odoo/odoo#97147

X-original-commit: 83e41d6f1adc30e24cda95c5f4ab2a875e1bcaa0
Signed-off-by: Josse Colpaert <jco@odoo.com>

addons/l10n_it_edi/data/invoice_it_template.xml

@@ -132,7 +132,7 @@
                     <BolloVirtuale>SI</BolloVirtuale>
                     <ImportoBollo t-esc="format_numbers(record.l10n_it_stamp_duty)"/>
                 </DatiBollo>
-                <ImportoTotaleDocumento t-esc="format_monetary(record.amount_total, currency)"/>
+                <ImportoTotaleDocumento t-esc="format_monetary(document_total, currency)"/>
             </DatiGeneraliDocumento>
             <DatiOrdineAcquisto t-if="record.ref">
                 <IdDocumento t-esc="format_alphanumeric(record.ref[:20])"/>

addons/l10n_it_edi/models/account_invoice.py

@@ -178,6 +178,12 @@ class AccountMove(models.Model):
             or (partner.country_id.code == 'IT' and '0000000')
             or 'XXXXXXX')
 
+        # Self-invoices are technically -100%/+100% repartitioned
+        # but functionally need to be exported as 100%
+        document_total = self.amount_total
+        if is_self_invoice:
+            document_total += sum([v['tax_amount_currency'] for k, v in tax_details['tax_details'].items()])
+
         # Create file content.
         template_values = {
             'record': self,
@@ -191,6 +197,7 @@ class AccountMove(models.Model):
             'seller': seller,
             'seller_partner': company.partner_id if not is_self_invoice else partner,
             'currency': self.currency_id or self.company_currency_id,
+            'document_total': document_total,
             'representative': company.l10n_it_tax_representative_partner_id,
             'codice_destinatario': codice_destinatario,
             'regime_fiscale': company.l10n_it_tax_system if not is_self_invoice else 'RF01',

addons/l10n_it_edi_sdicoop/tests/expected_xmls/reverse_charge_bill.xml

@@ -54,7 +54,7 @@
                 <Divisa>EUR</Divisa>
                 <Data>2022-03-24</Data>
                 <Numero>BILL/2022/03/0001</Numero>
-                <ImportoTotaleDocumento>1600.80</ImportoTotaleDocumento>
+                <ImportoTotaleDocumento>1808.91</ImportoTotaleDocumento>
             </DatiGeneraliDocumento>
         </DatiGenerali>
         <DatiBeniServizi>