diff --git a/account_fiscal_position_constraints/README.rst b/account_fiscal_position_constraints/README.rst
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+.. image:: https://img.shields.io/badge/license-AGPL--3-blue.png
+   :target: https://www.gnu.org/licenses/agpl
+   :alt: License: AGPL-3
+
+===================================
+Account Fiscal Position constraints
+===================================
+
+This module prohibits the removal of a fiscal position when this position
+is already used in invoices or partner records.
+
+The module also enforces fiscal position names to be unique per company.
diff --git a/account_fiscal_position_constraints/__init__.py b/account_fiscal_position_constraints/__init__.py
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+++ b/account_fiscal_position_constraints/__init__.py
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+from . import models
diff --git a/account_fiscal_position_constraints/__manifest__.py b/account_fiscal_position_constraints/__manifest__.py
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+++ b/account_fiscal_position_constraints/__manifest__.py
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+# Copyright 2009-2019 Noviat.
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+{
+    'name': 'Account Fiscal Position constraints',
+    'version': '11.0.1.0.0',
+    'category': 'Accounting & Finance',
+    'website': 'https://www.noviat.com',
+    'author': 'Noviat',
+    'license': 'AGPL-3',
+    'installable': True,
+    'depends': [
+        'account',
+    ],
+}
diff --git a/account_fiscal_position_constraints/models/__init__.py b/account_fiscal_position_constraints/models/__init__.py
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+++ b/account_fiscal_position_constraints/models/__init__.py
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+from . import account_fiscal_position
diff --git a/account_fiscal_position_constraints/models/account_fiscal_position.py b/account_fiscal_position_constraints/models/account_fiscal_position.py
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+++ b/account_fiscal_position_constraints/models/account_fiscal_position.py
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+# Copyright 2009-2019 Noviat.
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import api, fields, models, _
+from odoo.exceptions import UserError
+
+
+class AccountFiscalPosition(models.Model):
+    _inherit = 'account.fiscal.position'
+
+    company_id = fields.Many2one(
+        required=True, default=lambda self: self.env.user.company_id)
+
+    _sql_constraints = [(
+        'name_company_uniq',
+        'unique (name, company_id)',
+        'The name of the fiscal position must be unique per company !')]
+
+    @api.one
+    @api.returns('self', lambda value: value.id)
+    def copy(self, default=None):
+        default = dict(default or {})
+        default.setdefault('name', _("%s (copy)") % (self.name or ''))
+        return super().copy(default)
+
+    @api.multi
+    def unlink(self):
+        for fpos in self:
+
+            partners = self.env['res.partner'].with_context(
+                active_test=False).search(
+                    [('property_account_position_id', '=', fpos.id)])
+            if partners:
+                partner_list = [
+                    '%s (ID:%s)' % (x.name, x.id) for x in partners]
+                raise UserError(_(
+                    "You cannot delete a fiscal position that "
+                    "has been set on partner records"
+                    "\nAs an alterative, you can disable a "
+                    "fiscal position via the 'active' flag."
+                    "\n\nPartner records: %s") % partner_list)
+
+            invoices = self.env['account.invoice'].with_context(
+                active_test=False).search(
+                    [('fiscal_position_id', '=', fpos.id)])
+            if invoices:
+                invoice_list = [
+                    '%s (ID:%s)' % (x.number or 'n/a', x.id)
+                    for x in invoices]
+                raise UserError(_(
+                    "You cannot delete a fiscal position that "
+                    "has been used on invoices"
+                    "\nAs an alterative, you can disable a "
+                    "fiscal position via the 'active' flag."
+                    "\n\nInvoices: %s") % invoice_list)
+
+        return super().unlink()
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