diff --git a/stock_location_package_restriction/models/stock_location.py b/stock_location_package_restriction/models/stock_location.py
index 862dd69c9..cb312cce5 100644
--- a/stock_location_package_restriction/models/stock_location.py
+++ b/stock_location_package_restriction/models/stock_location.py
@@ -41,14 +41,20 @@ class StockLocation(models.Model):
         ]
 
     has_package_restriction_violation = fields.Boolean(
-        compute="_compute_has_package_restriction_violation",
+        compute="_compute_package_restriction_violation",
         search="_search_has_package_restriction_violation",
     )
 
+    package_restriction_violation_message = fields.Char(
+        compute="_compute_package_restriction_violation",
+    )
+
     def _has_package_restriction_violation_query(self):
         self.flush()
         query = """
-            SELECT stock_quant.location_id
+            SELECT stock_quant.location_id,
+            (count(distinct(stock_quant.package_id)) > 1)::bool as has_multiple_packages,
+            (count(*) FILTER (WHERE stock_quant.package_id IS NULL) > 0)::bool as has_no_package
             FROM stock_quant
             JOIN stock_location ON stock_location.id = stock_quant.location_id
             WHERE
@@ -78,13 +84,50 @@ class StockLocation(models.Model):
         return query
 
     @api.depends("package_restriction")
-    def _compute_has_package_restriction_violation(self):
+    def _compute_package_restriction_violation(self):
         self.env.cr.execute(
             self._has_package_restriction_violation_query(), (tuple(self.ids),)
         )
-        error_ids = [r[0] for r in self.env.cr.fetchall()]
+        errors = {r[0]: r[1:] for r in self.env.cr.fetchall()}
         for location in self:
-            location.has_package_restriction_violation = location.id in error_ids
+            error = errors.get(location.id)
+            if not error:
+                location.has_package_restriction_violation = False
+                location.package_restriction_violation_message = False
+                continue
+            location.has_package_restriction_violation = True
+            if location.package_restriction == NOPACKAGE:
+                location.package_restriction_violation_message = _(
+                    "This location should only contain items without package "
+                    "but it contains the package(s): {packages}"
+                ).format(
+                    packages=", ".join(location.quant_ids.package_id.mapped("name"))
+                )
+            else:
+                messages = []
+                has_multiple_package, has_no_package = error
+                if has_multiple_package:
+                    messages.append(
+                        _(
+                            "This location should only contain a single package "
+                            "but it contains the package(s): {packages}"
+                        ).format(
+                            packages=", ".join(
+                                location.quant_ids.package_id.mapped("name")
+                            )
+                        )
+                    )
+                if has_no_package:
+                    products = location.quant_ids.filtered(
+                        lambda q: not q.package_id
+                    ).product_id
+                    messages.append(
+                        _(
+                            "This location should only contain items in a package "
+                            "but it contains the items of product(s): {products}"
+                        ).format(products=", ".join(products.mapped("name")))
+                    )
+                location.package_restriction_violation_message = "\n".join(messages)
 
     def _search_has_package_restriction_violation(self, operator, value):
         search_has_violation = (
diff --git a/stock_location_package_restriction/tests/test_stock_location.py b/stock_location_package_restriction/tests/test_stock_location.py
index 9c1772c26..e12196166 100644
--- a/stock_location_package_restriction/tests/test_stock_location.py
+++ b/stock_location_package_restriction/tests/test_stock_location.py
@@ -16,35 +16,42 @@ class TestStockLocation(TestLocationPackageRestrictionCommon):
         self._change_product_qty(self.product_1, self.location_1, False, 50)
         self.location_1.package_restriction = NOPACKAGE
         self.assertFalse(self.location_1.has_package_restriction_violation)
+        self.assertFalse(self.location_1.package_restriction_violation_message)
 
     def test_location_no_package_location_ko(self):
         self._change_product_qty(self.product_1, self.location_1, self.pack_1, 50)
         self.location_1.package_restriction = NOPACKAGE
         self.assertTrue(self.location_1.has_package_restriction_violation)
+        self.assertTrue(self.location_1.package_restriction_violation_message)
 
     def test_location_multi_package_location_ok(self):
         self._change_product_qty(self.product_1, self.location_1, self.pack_1, 50)
         self._change_product_qty(self.product_1, self.location_1, self.pack_2, 50)
         self.location_1.package_restriction = MULTIPACKAGE
         self.assertFalse(self.location_1.has_package_restriction_violation)
+        self.assertFalse(self.location_1.package_restriction_violation_message)
 
     def test_location_multi_package_location_ko(self):
         self._change_product_qty(self.product_1, self.location_1, False, 50)
         self.location_1.package_restriction = MULTIPACKAGE
         self.assertTrue(self.location_1.has_package_restriction_violation)
+        self.assertTrue(self.location_1.package_restriction_violation_message)
 
     def test_location_single_package_location_ok(self):
         self._change_product_qty(self.product_1, self.location_1, self.pack_1, 50)
         self.location_1.package_restriction = SINGLEPACKAGE
         self.assertFalse(self.location_1.has_package_restriction_violation)
+        self.assertFalse(self.location_1.package_restriction_violation_message)
 
     def test_location_single_package_location_ko_multi(self):
         self._change_product_qty(self.product_1, self.location_1, self.pack_1, 50)
         self._change_product_qty(self.product_1, self.location_1, self.pack_2, 50)
         self.location_1.package_restriction = SINGLEPACKAGE
         self.assertTrue(self.location_1.has_package_restriction_violation)
+        self.assertTrue(self.location_1.package_restriction_violation_message)
 
     def test_location_single_package_location_ko_no(self):
         self._change_product_qty(self.product_1, self.location_1, False, 50)
         self.location_1.package_restriction = SINGLEPACKAGE
         self.assertTrue(self.location_1.has_package_restriction_violation)
+        self.assertTrue(self.location_1.package_restriction_violation_message)
diff --git a/stock_location_package_restriction/views/stock_location.xml b/stock_location_package_restriction/views/stock_location.xml
index 2ec7e232e..7ffc38340 100644
--- a/stock_location_package_restriction/views/stock_location.xml
+++ b/stock_location_package_restriction/views/stock_location.xml
@@ -13,7 +13,7 @@
                     class="alert alert-danger"
                     role="alert"
                     attrs="{'invisible': [('has_package_restriction_violation','=',False)]}"
-                >Package restriction is not respected</div>
+                ><field name="package_restriction_violation_message" /></div>
             </div>
             <xpath expr="//group[last()]">
                 <group name="restrictions" string="Restrictions">