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l10n_it_edi_oss
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‎l10n_it_edi_oss/__init__.py‎

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from . import models
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from . import wizard
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OSS_EXEMPT_REASON = "N3.2"
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OSS_LAW_REFERENCE = "Art. 41 D.L. 331/1993"
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def _l10n_it_edi_oss_post_init_hook(env):
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oss_taxes = env["account.tax"].search(
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[
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("oss_country_id", "!=", False),
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("company_id.account_fiscal_country_id.code", "=", "IT"),
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"|",
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("l10n_it_exempt_reason", "=", False),
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("l10n_it_exempt_reason", "!=", OSS_EXEMPT_REASON),
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]
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)
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if oss_taxes:
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oss_taxes.write(
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{
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"l10n_it_exempt_reason": OSS_EXEMPT_REASON,
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"l10n_it_law_reference": OSS_LAW_REFERENCE,
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}
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)

‎l10n_it_edi_oss/__manifest__.py‎

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# Copyright 2026 Lorenzo Battistini
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# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
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{
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"name": "Italy - E-invoicing - OSS",
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"version": "18.0.1.0.0",
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"category": "Accounting/Localizations/EDI",
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"development_status": "Beta",
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"summary": "Bridge module between l10n_eu_oss_oca and Italian electronic invoicing",
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"author": "Lorenzo Battistini, Odoo Community Association (OCA)",
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"website": "https://github.com/OCA/l10n-italy",
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"license": "AGPL-3",
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"depends": [
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"l10n_it_edi",
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"l10n_eu_oss_oca",
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],
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"installable": True,
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"post_init_hook": "_l10n_it_edi_oss_post_init_hook",
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}

‎l10n_it_edi_oss/models/__init__.py‎

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from . import account_move

‎l10n_it_edi_oss/models/account_move.py‎

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# Copyright 2026 Lorenzo Battistini
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# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
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from odoo import api, models
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class AccountMove(models.Model):
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_inherit = "account.move"
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@api.model
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def _l10n_it_edi_grouping_function_base_lines(self, base_line, tax_data):
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result = super()._l10n_it_edi_grouping_function_base_lines(
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base_line, tax_data
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)
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if result and tax_data and tax_data["tax"].oss_country_id:
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result["tax_amount_field"] = 0.0
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return result
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@api.model
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def _l10n_it_edi_grouping_function_tax_lines(self, base_line, tax_data):
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result = super()._l10n_it_edi_grouping_function_tax_lines(
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base_line, tax_data
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)
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if result and tax_data and tax_data["tax"].oss_country_id:
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result["tax_amount_field"] = 0.0
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result["is_oss"] = True
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return result
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def _l10n_it_edi_add_base_lines_xml_values(
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self, base_lines_aggregated_values, is_downpayment
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):
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super()._l10n_it_edi_add_base_lines_xml_values(
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base_lines_aggregated_values, is_downpayment
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)
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for base_line, _aggregated_values in base_lines_aggregated_values:
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oss_taxes = base_line["tax_ids"].filtered(lambda t: t.oss_country_id)
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if oss_taxes:
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base_line["it_values"]["altri_dati_gestionali_list"].append(
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{
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"tipo_dato": "OSS",
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"riferimento_testo": f"{oss_taxes[0].amount:.2f}",
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"riferimento_numero": None,
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"riferimento_data": None,
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}
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)
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def _l10n_it_edi_get_tax_lines_xml_values(
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self, base_lines_aggregated_values, values_per_grouping_key
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):
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tax_lines = super()._l10n_it_edi_get_tax_lines_xml_values(
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base_lines_aggregated_values, values_per_grouping_key
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)
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# Set imposta to 0.0 for OSS entries.
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# Iterate values_per_grouping_key in the same order as super() to
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# correlate grouping keys with the returned tax_lines by index.
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idx = 0
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for values in values_per_grouping_key.values():
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grouping_key = values["grouping_key"]
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if not grouping_key or grouping_key.get("skip"):
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continue
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if grouping_key.get("is_oss") and idx < len(tax_lines):
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tax_lines[idx]["imposta"] = 0.0
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idx += 1
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return tax_lines

‎l10n_it_edi_oss/readme/CONTRIBUTORS.md‎

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- Lorenzo Battistini

‎l10n_it_edi_oss/readme/DESCRIPTION.md‎

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Modulo tecnico per l'integrazione tra `l10n_eu_oss_oca` (regime OSS - One Stop Shop)
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e `l10n_it_edi` (fatturazione elettronica italiana).
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Quando viene emessa una fattura con un'imposta OSS, il modulo modifica la generazione
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del file XML FatturaPA per:
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- Impostare AliquotaIVA a 0,00 (invece dell'aliquota estera effettiva)
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- Aggiungere il codice Natura N3.2 (non imponibile - cessioni intracomunitarie)
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- Aggiungere un blocco AltriDatiGestionali con TipoDato "OSS" e l'aliquota effettiva
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- Impostare Imposta a 0,00 nel riepilogo DatiRiepilogo
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- Aggiungere il RiferimentoNormativo con il riferimento all'Art. 41 D.L. 331/1993
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Inoltre, quando vengono create nuove imposte OSS tramite il wizard di `l10n_eu_oss_oca`,
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il modulo imposta automaticamente il codice Natura e il riferimento normativo.
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---
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Technical module integrating `l10n_eu_oss_oca` (OSS - One Stop Shop regime) with
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`l10n_it_edi` (Italian electronic invoicing).
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When an invoice is issued with an OSS tax, this module modifies the FatturaPA XML
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generation to:
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- Set AliquotaIVA to 0.00 (instead of the actual foreign tax rate)
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- Add the Natura code N3.2 (non-taxable - intra-community transfers)
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- Add an AltriDatiGestionali block with TipoDato "OSS" and the actual tax rate
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- Set Imposta to 0.00 in the DatiRiepilogo summary
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- Add the RiferimentoNormativo with the reference to Art. 41 D.L. 331/1993
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Additionally, when new OSS taxes are created through the `l10n_eu_oss_oca` wizard,
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the module automatically sets the Natura code and law reference.

‎l10n_it_edi_oss/tests/__init__.py‎

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from . import test_edi_oss_export

‎l10n_it_edi_oss/tests/export_xmls/oss_invoice.xml‎

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<?xml version='1.0' encoding='UTF-8' ?>
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<p:FatturaElettronica
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xmlns:p="http://ivaservizi.agenziaentrate.gov.it/docs/xsd/fatture/v1.2"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
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xsi:schemaLocation="http://ivaservizi.agenziaentrate.gov.it/docs/xsd/fatture/v1.2 http://www.fatturapa.gov.it/export/fatturazione/sdi/fatturapa/v1.2/Schema_del_file_xml_FatturaPA_versione_1.2.xsd"
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versione="FPR12"
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>
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<FatturaElettronicaHeader>
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<DatiTrasmissione>
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<IdTrasmittente>
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<IdPaese>IT</IdPaese>
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<IdCodice>01234560157</IdCodice>
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</IdTrasmittente>
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<ProgressivoInvio>___ignore___</ProgressivoInvio>
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<FormatoTrasmissione>FPR12</FormatoTrasmissione>
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<CodiceDestinatario>XXXXXXX</CodiceDestinatario>
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<ContattiTrasmittente>
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<Telefono>0266766700</Telefono>
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<Email>test@test.it</Email>
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</ContattiTrasmittente>
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</DatiTrasmissione>
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<CedentePrestatore>
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<DatiAnagrafici>
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<IdFiscaleIVA>
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<IdPaese>IT</IdPaese>
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<IdCodice>01234560157</IdCodice>
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</IdFiscaleIVA>
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<CodiceFiscale>01234560157</CodiceFiscale>
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<Anagrafica>
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<Denominazione>company_2_data</Denominazione>
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</Anagrafica>
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<RegimeFiscale>RF01</RegimeFiscale>
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</DatiAnagrafici>
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<Sede>
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<Indirizzo>1234 Test Street</Indirizzo>
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<CAP>12345</CAP>
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<Comune>Prova</Comune>
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<Nazione>IT</Nazione>
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</Sede>
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</CedentePrestatore>
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<CessionarioCommittente>
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<DatiAnagrafici>
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<IdFiscaleIVA>
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<IdPaese>FR</IdPaese>
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<IdCodice>23334175221</IdCodice>
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</IdFiscaleIVA>
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<Anagrafica>
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<Denominazione>French Partner</Denominazione>
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</Anagrafica>
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</DatiAnagrafici>
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<Sede>
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<Indirizzo>1 Rue de la Paix</Indirizzo>
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<CAP>00000</CAP>
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<Comune>Paris</Comune>
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<Nazione>FR</Nazione>
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</Sede>
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</CessionarioCommittente>
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</FatturaElettronicaHeader>
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<FatturaElettronicaBody>
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<DatiGenerali>
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<DatiGeneraliDocumento>
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<TipoDocumento>TD01</TipoDocumento>
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<Divisa>EUR</Divisa>
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<Data>2019-01-01</Data>
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<Numero>___ignore___</Numero>
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<ImportoTotaleDocumento>120.00</ImportoTotaleDocumento>
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</DatiGeneraliDocumento>
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</DatiGenerali>
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<DatiBeniServizi>
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<DettaglioLinee>
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<NumeroLinea>1</NumeroLinea>
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<Descrizione>test line</Descrizione>
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<Quantita>1.00</Quantita>
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<PrezzoUnitario>100.00000000</PrezzoUnitario>
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<PrezzoTotale>100.00000000</PrezzoTotale>
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<AliquotaIVA>0.00</AliquotaIVA>
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<Natura>N3.2</Natura>
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<AltriDatiGestionali>
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<TipoDato>OSS</TipoDato>
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<RiferimentoTesto>20.00</RiferimentoTesto>
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</AltriDatiGestionali>
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</DettaglioLinee>
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<DatiRiepilogo>
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<AliquotaIVA>0.00</AliquotaIVA>
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<Natura>N3.2</Natura>
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<ImponibileImporto>100.00</ImponibileImporto>
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<Imposta>0.00</Imposta>
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<EsigibilitaIVA>I</EsigibilitaIVA>
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<RiferimentoNormativo>Art. 41 D.L. 331/1993</RiferimentoNormativo>
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</DatiRiepilogo>
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</DatiBeniServizi>
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<DatiPagamento>
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<CondizioniPagamento>TP02</CondizioniPagamento>
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<DettaglioPagamento>
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<ModalitaPagamento>MP05</ModalitaPagamento>
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<DataScadenzaPagamento>2019-01-01</DataScadenzaPagamento>
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<ImportoPagamento>120.00</ImportoPagamento>
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<CodicePagamento>___ignore___</CodicePagamento>
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</DettaglioPagamento>
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</DatiPagamento>
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</FatturaElettronicaBody>
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</p:FatturaElettronica>

‎l10n_it_edi_oss/tests/test_edi_oss_export.py‎

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# Copyright 2026 Lorenzo Battistini
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# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
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from odoo.tests import tagged
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from odoo.addons.l10n_it_edi.tests.common import TestItEdi
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@tagged("post_install_l10n", "post_install", "-at_install")
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class TestEdiOssExport(TestItEdi):
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@classmethod
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def setUpClass(cls):
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super().setUpClass()
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cls.module = "l10n_it_edi_oss"
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cls.french_partner = cls.env["res.partner"].create(
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{
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"name": "French Partner",
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"vat": "FR23334175221",
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"country_id": cls.env.ref("base.fr").id,
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"street": "1 Rue de la Paix",
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"city": "Paris",
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"company_id": False,
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"is_company": True,
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"invoice_edi_format": "it_edi_xml",
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}
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)
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cls.oss_tax_fr = (
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cls.env["account.tax"]
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.with_company(cls.company)
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.create(
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{
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"name": "OSS for EU to France: 20.0",
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"amount": 20.0,
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"amount_type": "percent",
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"type_tax_use": "sale",
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"oss_country_id": cls.env.ref("base.fr").id,
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"l10n_it_exempt_reason": "N3.2",
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"l10n_it_law_reference": "Art. 41 D.L. 331/1993",
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"sequence": 1000,
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}
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)
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)
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def test_oss_invoice_export(self):
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"""OSS invoice exports with AliquotaIVA=0.00, Natura=N3.2,
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AltriDatiGestionali with OSS data, and Imposta=0.00."""
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invoice = self.init_invoice(
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"out_invoice",
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amounts=[100],
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company=self.company,
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partner=self.french_partner,
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taxes=self.oss_tax_fr,
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)
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invoice.invoice_date_due = invoice.date
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invoice.action_post()
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self._assert_export_invoice(invoice, "oss_invoice.xml")

‎l10n_it_edi_oss/wizard/__init__.py‎

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from . import l10n_eu_oss_wizard

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