diff --git a/addons/l10n_fr_pos_cert/i18n/l10n_fr_pos_cert.pot b/addons/l10n_fr_pos_cert/i18n/l10n_fr_pos_cert.pot
index 4e1507eb9f0..ca60d0c4779 100644
--- a/addons/l10n_fr_pos_cert/i18n/l10n_fr_pos_cert.pot
+++ b/addons/l10n_fr_pos_cert/i18n/l10n_fr_pos_cert.pot
@@ -66,6 +66,11 @@ msgstr ""
 msgid "Corrupted data on point of sale order with id %s."
 msgstr ""
 
+#. module: l10n_fr_pos_cert
+#: model:ir.model,name:l10n_fr_pos_cert.model_account_fiscal_position
+msgid "Fiscal Position"
+msgstr ""
+
 #. module: l10n_fr_pos_cert
 #: model:ir.ui.menu,name:l10n_fr_pos_cert.pos_fr_statements_menu
 msgid "French Statements"
@@ -137,7 +142,13 @@ msgid "This session has been opened another day. To comply with the French law,
 msgstr ""
 
 #. module: l10n_fr_pos_cert
-#: code:addons/l10n_fr_pos_cert/models/account_bank_statement.py:11
+#: code:addons/l10n_fr_pos_cert/models/account_fiscal_position.py:14
+#, python-format
+msgid "You cannot modify a fiscal position used in a POS order. You should archive it and create a new one."
+msgstr ""
+
+#. module: l10n_fr_pos_cert
+#: code:addons/l10n_fr_pos_cert/models/account_bank_statement.py:12
 #, python-format
 msgid "You cannot modify anything on a bank statement (name: %s) that was created by point of sale operations."
 msgstr ""
diff --git a/addons/l10n_fr_pos_cert/models/__init__.py b/addons/l10n_fr_pos_cert/models/__init__.py
index e56d2fcd33c..92fba1e252d 100644
--- a/addons/l10n_fr_pos_cert/models/__init__.py
+++ b/addons/l10n_fr_pos_cert/models/__init__.py
@@ -1,3 +1,4 @@
 import account_bank_statement
+from . import account_fiscal_position
 import res_company
-import pos
\ No newline at end of file
+import pos
diff --git a/addons/l10n_fr_pos_cert/models/account_fiscal_position.py b/addons/l10n_fr_pos_cert/models/account_fiscal_position.py
new file mode 100644
index 00000000000..71b4b12155a
--- /dev/null
+++ b/addons/l10n_fr_pos_cert/models/account_fiscal_position.py
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+
+from odoo import _, models
+from odoo.exceptions import UserError
+
+
+class AccountFiscalPosition(models.Model):
+    _inherit = "account.fiscal.position"
+
+    def write(self, vals):
+        if "tax_ids" in vals:
+            if self.env["pos.order"].sudo().search_count([("fiscal_position_id", "in", self.ids)]):
+                raise UserError(
+                    _(
+                        "You cannot modify a fiscal position used in a POS order. "
+                        + "You should archive it and create a new one."
+                    )
+                )
+        return super(AccountFiscalPosition, self).write(vals)