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diff --git a/addons/l10n_it_edi/models/res_partner.py b/addons/l10n_it_edi/models/res_partner.py
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+++ b/addons/l10n_it_edi/models/res_partner.py
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+# -*- coding:utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, fields, models, _
+from odoo.exceptions import UserError, ValidationError
+
+import re
+
+
+class ResPartner(models.Model):
+    _name = 'res.partner'
+    _inherit = 'res.partner'
+
+    l10n_it_pec_email = fields.Char(string="PEC e-mail")
+    l10n_it_codice_fiscale = fields.Char(string="Codice Fiscale", size=16)
+    l10n_it_pa_index = fields.Char(string="PA index",
+        size=7,
+        help="Must contain the 6-character (or 7) code, present in the PA\
+              Index in the information relative to the electronic invoicing service,\
+              associated with the office which, within the addressee administration, deals\
+              with receiving (and processing) the invoice.")
+
+    _sql_constraints = [
+        ('l10n_it_codice_fiscale',
+            "CHECK(l10n_it_codice_fiscale IS NULL OR l10n_it_codice_fiscale = '' OR LENGTH(l10n_it_codice_fiscale) >= 11)",
+            "Codice fiscale must have between 11 and 16 characters."),
+
+        ('l10n_it_pa_index',
+            "CHECK(l10n_it_pa_index IS NULL OR l10n_it_pa_index = '' OR LENGTH(l10n_it_pa_index) >= 6)",
+            "PA index must have between 6 and 7 characters."),
+    ]
+
+    @api.model
+    def _l10n_it_normalize_codice_fiscale(self, codice):
+        if codice and re.match(r'^IT[0-9]{11}$', codice):
+            return codice[2:13]
+        return codice
+
+    @api.onchange('vat')
+    def _l10n_it_onchange_vat(self):
+        if not self.l10n_it_codice_fiscale:
+            self.l10n_it_codice_fiscale = self._l10n_it_normalize_codice_fiscale(self.vat)
+
+    @api.constrains('l10n_it_codice_fiscale')
+    def validate_codice_fiscale(self):
+        p = re.compile(r'^([A-Za-z]{6}[0-9]{2}[A-Za-z]{1}[0-9]{2}[A-Za-z]{1}[0-9]{3}[A-Za-z]{1}$)|([0-9]{11})|(IT[0-9]{11})$')
+        for record in self:
+            if record.l10n_it_codice_fiscale and not p.match(record.l10n_it_codice_fiscale):
+                raise UserError(_("Invalid Codice Fiscale '%s': should be like 'MRTMTT91D08F205J' for physical person and '12345678901' or 'IT12345678901' for businesses.", record.l10n_it_codice_fiscale))