diff --git a/addons/stock/models/stock_inventory.py b/addons/stock/models/stock_inventory.py
index e8b76317630..64a370b430a 100644
--- a/addons/stock/models/stock_inventory.py
+++ b/addons/stock/models/stock_inventory.py
@@ -135,6 +135,7 @@ class Inventory(models.Model):
 
     def action_cancel_draft(self):
         self.mapped('move_ids')._action_cancel()
+        self.line_ids.unlink()
         self.write({'state': 'draft'})
 
     def action_start(self):
diff --git a/addons/stock/tests/test_inventory.py b/addons/stock/tests/test_inventory.py
index d1be07924d3..d5703170494 100644
--- a/addons/stock/tests/test_inventory.py
+++ b/addons/stock/tests/test_inventory.py
@@ -333,6 +333,72 @@ class TestInventory(SavepointCase):
             self.assertEqual(line.product_qty, 0)
             self.assertNotEqual(line.theoretical_qty, 0)
 
+    def test_inventory_9_cancel_then_start(self):
+        """ Checks when we cancel an inventory, then change its locations and/or
+        products setup and restart it, it will remove all its lines and restart
+        like a new inventory.
+        """
+        # Creates some records needed for the test...
+        product2 = self.env['product.product'].create({
+            'name': 'Product B',
+            'type': 'product',
+            'categ_id': self.env.ref('product.product_category_all').id,
+        })
+        loc1 = self.env['stock.location'].create({
+            'name': 'SafeRoom A',
+            'usage': 'internal',
+            'location_id': self.stock_location.id,
+        })
+        # Adds some quants.
+        self.env['stock.quant'].create({
+            'product_id': self.product1.id,
+            'product_uom_id': self.uom_unit.id,
+            'location_id': loc1.id,
+            'quantity': 7,
+            'reserved_quantity': 0,
+        })
+        self.env['stock.quant'].create({
+            'product_id': self.product1.id,
+            'product_uom_id': self.uom_unit.id,
+            'location_id': self.stock_location.id,
+            'quantity': 7,
+            'reserved_quantity': 0,
+        })
+        self.env['stock.quant'].create({
+            'product_id': product2.id,
+            'product_uom_id': self.uom_unit.id,
+            'location_id': loc1.id,
+            'quantity': 7,
+            'reserved_quantity': 0,
+        })
+        self.env['stock.quant'].create({
+            'product_id': product2.id,
+            'product_uom_id': self.uom_unit.id,
+            'location_id': self.stock_location.id,
+            'quantity': 7,
+            'reserved_quantity': 0,
+        })
+        # Creates the inventory and configures if for product1
+        inventory_form = Form(self.env['stock.inventory'], view='stock.view_inventory_form')
+        inventory_form.product_ids.add(self.product1)
+        inventory = inventory_form.save()
+        inventory.action_start()
+        # Must have two inventory lines about product1.
+        self.assertEqual(len(inventory.line_ids), 2)
+        for line in inventory.line_ids:
+            self.assertEqual(line.product_id.id, self.product1.id)
+
+        # Cancels the inventory and changes for product2 in its setup.
+        inventory.action_cancel_draft()
+        inventory_form = Form(inventory)
+        inventory_form.product_ids.remove(self.product1.id)
+        inventory_form.product_ids.add(product2)
+        inventory = inventory_form.save()
+        inventory.action_start()
+        # Must have two inventory lines about product2.
+        self.assertEqual(len(inventory.line_ids), 2)
+        self.assertEqual(inventory.line_ids.product_id.id, product2.id)
+
     def test_inventory_prefill_counted_quantity(self):
         """ Checks that inventory lines have a `product_qty` set on zero or
         equals to quantity on hand, depending of the `prefill_counted_quantity`.
diff --git a/addons/stock/views/stock_inventory_views.xml b/addons/stock/views/stock_inventory_views.xml
index 582b76e48b4..2b325c6297a 100644
--- a/addons/stock/views/stock_inventory_views.xml
+++ b/addons/stock/views/stock_inventory_views.xml
@@ -170,7 +170,8 @@
                 <button name="action_open_inventory_lines" states="confirm" string="Continue Inventory" type="object" class="oe_highlight" groups="stock.group_stock_user"/>
                 <button name="action_validate" states="confirm" string="Validate Inventory" type="object" class="oe_highlight" groups="stock.group_stock_manager"/>
                 <button name="action_cancel_draft" states="cancel" string="Set to Draft" type="object"/>
-                <button name="action_cancel_draft" states="confirm" string="Cancel Inventory" type="object"/>
+                <button name="action_cancel_draft" states="confirm" string="Cancel Inventory" type="object"
+                    confirm="If you cancel this inventory adjustment, all its inventory adjustment lines will be lost. Are you sure you want to discard it ?"/>
                 <field name="state" widget="statusbar" statusbar_visible="draft,confirm,done"/>
             </header>
             <sheet>