diff --git a/l10n_fr_ecotaxe/models/ecotaxe_line_product.py b/l10n_fr_ecotaxe/models/ecotaxe_line_product.py
index a599d4f99..cfe32bc99 100644
--- a/l10n_fr_ecotaxe/models/ecotaxe_line_product.py
+++ b/l10n_fr_ecotaxe/models/ecotaxe_line_product.py
@@ -51,3 +51,16 @@ def _compute_ecotaxe(self):
             if ecotaxeline.force_ecotaxe_amount:
                 amt = ecotaxeline.force_ecotaxe_amount
             ecotaxeline.ecotaxe_amount = amt
+
+    _sql_constraints = [
+        (
+            "unique_ecotaxe_classification_id_by_product",
+            "UNIQUE(ecotaxe_classification_id, product_id)",
+            "Only one ecotaxe classification occurrence by product",
+        ),
+        (
+            "unique_ecotaxe_classification_id_by_product_tmpl",
+            "UNIQUE(ecotaxe_classification_id, product_tmplt_id)",
+            "Only one ecotaxe classification occurrence by product Template",
+        ),
+    ]
diff --git a/l10n_fr_ecotaxe/views/account_move_view.xml b/l10n_fr_ecotaxe/views/account_move_view.xml
index 5ee715705..017bfd0f6 100644
--- a/l10n_fr_ecotaxe/views/account_move_view.xml
+++ b/l10n_fr_ecotaxe/views/account_move_view.xml
@@ -13,8 +13,16 @@
                 expr="//field[@name='invoice_line_ids']/tree/field[@name='tax_ids']"
                 position="after"
             >
-                <field name="subtotal_ecotaxe" optional="show" attrs="{'invisible': [('parent.move_type', 'not in', ('out_invoice', 'out_refund', 'out_receipt'))]}"/>
-                <field name="ecotaxe_amount_unit" optional="hide" attrs="{'invisible': [('parent.move_type', 'not in', ('out_invoice', 'out_refund', 'out_receipt'))]}"/>
+                <field
+                    name="subtotal_ecotaxe"
+                    optional="show"
+                    attrs="{'invisible': [('parent.move_type', 'not in', ('out_invoice', 'out_refund', 'out_receipt'))]}"
+                />
+                <field
+                    name="ecotaxe_amount_unit"
+                    optional="hide"
+                    attrs="{'invisible': [('parent.move_type', 'not in', ('out_invoice', 'out_refund', 'out_receipt'))]}"
+                />
             </xpath>
             <xpath
                 expr="//field[@name='invoice_line_ids']/tree/field[last()]"
@@ -39,7 +47,11 @@
                 expr="//field[@name='invoice_line_ids']/form/sheet/field[@name='name']"
                 position="after"
             >
-                <field name="ecotaxe_line_ids" colspan="2" attrs="{'invisible': [('parent.move_type', 'not in', ('out_invoice', 'out_refund', 'out_receipt'))]}">
+                <field
+                    name="ecotaxe_line_ids"
+                    colspan="2"
+                    attrs="{'invisible': [('parent.move_type', 'not in', ('out_invoice', 'out_refund', 'out_receipt'))]}"
+                >
                     <tree editable="bottom">
                         <field name="ecotaxe_classification_id" />
                         <field name="force_ecotaxe_unit" />
@@ -47,12 +59,21 @@
                         <field name="ecotaxe_amount_total" />
                     </tree>
                 </field>
-                <field name="subtotal_ecotaxe" attrs="{'invisible': [('parent.move_type', 'not in', ('out_invoice', 'out_refund', 'out_receipt'))]}"/>
-                <field name="ecotaxe_amount_unit" attrs="{'invisible': [('parent.move_type', 'not in', ('out_invoice', 'out_refund', 'out_receipt'))]}"/>
+                <field
+                    name="subtotal_ecotaxe"
+                    attrs="{'invisible': [('parent.move_type', 'not in', ('out_invoice', 'out_refund', 'out_receipt'))]}"
+                />
+                <field
+                    name="ecotaxe_amount_unit"
+                    attrs="{'invisible': [('parent.move_type', 'not in', ('out_invoice', 'out_refund', 'out_receipt'))]}"
+                />
             </xpath>
             <xpath expr="//field[@name='tax_totals']" position="after">
-                    <field name="amount_ecotaxe" class="oe_subtotal_footer_separator"
-                           attrs="{'invisible': [ '|', ('move_type', 'not in', ('out_invoice', 'out_refund', 'out_receipt')), ('amount_ecotaxe', '=', 0)]}"/>
+                    <field
+                    name="amount_ecotaxe"
+                    class="oe_subtotal_footer_separator"
+                    attrs="{'invisible': [ '|', ('move_type', 'not in', ('out_invoice', 'out_refund', 'out_receipt')), ('amount_ecotaxe', '=', 0)]}"
+                />
             </xpath>
         </field>
     </record>
diff --git a/l10n_fr_ecotaxe/views/product_template_view.xml b/l10n_fr_ecotaxe/views/product_template_view.xml
index 93bd7d2cd..f36a182f4 100644
--- a/l10n_fr_ecotaxe/views/product_template_view.xml
+++ b/l10n_fr_ecotaxe/views/product_template_view.xml
@@ -11,7 +11,10 @@
         <field name="arch" type="xml">
 
             <xpath expr="//label[@for='list_price']" position="before">
-                <label for="ecotaxe_line_product_ids" string="Ecotaxe classification" />
+                <label
+                    for="ecotaxe_line_product_ids"
+                    string="Product Template Ecotaxe classif"
+                />
                 <div>
                     <field name="ecotaxe_line_product_ids" colspan="2" nolabel="1">
                         <tree editable="bottom">
diff --git a/l10n_fr_ecotaxe/views/product_view.xml b/l10n_fr_ecotaxe/views/product_view.xml
index 562be456f..db1d37d76 100644
--- a/l10n_fr_ecotaxe/views/product_view.xml
+++ b/l10n_fr_ecotaxe/views/product_view.xml
@@ -51,5 +51,30 @@
             </group>
         </field>
     </record>
-
+    <record id="product_normal_form_view" model="ir.ui.view">
+        <field name="name">usability.product.product.form</field>
+        <field name="model">product.product</field>
+        <field name="inherit_id" ref="product.product_normal_form_view" />
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='ecotaxe_line_product_ids']/.." position="after">
+                <label
+                    for="additional_ecotaxe_line_product_ids"
+                    string="Additional Ecotaxe classif"
+                />
+                    <div>
+                        <field
+                        name="additional_ecotaxe_line_product_ids"
+                        colspan="2"
+                        nolabel="1"
+                    >
+                            <tree editable="bottom">
+                                <field name="ecotaxe_classification_id" />
+                                <field name="force_ecotaxe_amount" />
+                                <field name="ecotaxe_amount" />
+                            </tree>
+                        </field>
+                    </div>
+            </xpath>
+        </field>
+    </record>
 </odoo>