diff --git a/partner_identification/models/res_partner_id_category.py b/partner_identification/models/res_partner_id_category.py
index 6a04a8b86..aab64ac9b 100644
--- a/partner_identification/models/res_partner_id_category.py
+++ b/partner_identification/models/res_partner_id_category.py
@@ -33,21 +33,9 @@ class ResPartnerIdCategory(models.Model):
     )
     active = fields.Boolean(string="Active", default=True)
     validation_code = fields.Text(
-        "Python validation code",
-        help="Python code called to validate an id number.",
-        default=lambda self: self._default_validation_code(),
+        "Python validation code", help="Python code called to validate an id number."
     )
 
-    def _default_validation_code(self):
-        return _(
-            "\n# Python code. Use failed = True to specify that the id "
-            "number is not valid.\n"
-            "# You can use the following variables :\n"
-            "#  - self: browse_record of the current ID Category "
-            "browse_record\n"
-            "#  - id_number: browse_record of ID number to validate"
-        )
-
     def _validation_eval_context(self, id_number):
         self.ensure_one()
         return {"self": self, "id_number": id_number}
diff --git a/partner_identification/models/res_partner_id_number.py b/partner_identification/models/res_partner_id_number.py
index c5c3d7fe3..22323e9aa 100644
--- a/partner_identification/models/res_partner_id_number.py
+++ b/partner_identification/models/res_partner_id_number.py
@@ -68,3 +68,14 @@ class ResPartnerIdNumber(models.Model):
         ]
     )
     active = fields.Boolean(string="Active", default=True)
+
+    @api.model
+    def default_get(self, fields):
+        res = super(ResPartnerIdNumber, self).default_get(fields)
+        # It seems to be a bug in native odoo that the field partner_id
+        # is not in the fields list by default. A workaround is required
+        # to force this.
+        if "default_partner_id" in self._context and "partner_id" not in fields:
+            fields.append("partner_id")
+            res["partner_id"] = self._context.get("default_partner_id")
+        return res
diff --git a/partner_identification/views/res_partner_id_category_view.xml b/partner_identification/views/res_partner_id_category_view.xml
index d9763608b..78952e71c 100644
--- a/partner_identification/views/res_partner_id_category_view.xml
+++ b/partner_identification/views/res_partner_id_category_view.xml
@@ -7,10 +7,38 @@
         <field name="type">form</field>
         <field name="arch" type="xml">
             <form string="Partner Identification Categories">
-                <group>
-                    <field name="name" />
-                    <field name="code" />
-                </group>
+                <sheet>
+                    <group>
+                        <group>
+                            <field name="name" />
+                            <field name="code" />
+                            <field name="validation_code" />
+                        </group>
+                        <group>
+                            <div class="alert alert-primary" role="alert">
+                                <h4>Python Validation Code:</h4>
+                                <pre>
+# Use failed = True to specify that the id number is not valid.
+# You can use the following variables :
+#  - self: browse_record of the current ID Category browse_record
+#  - id_number: browse_record of ID number to validate
+
+<b><i># Sample 1: ID number only contains digits</i></b>
+if not id_number.name.isdigit():
+    failed = True
+else:
+    failed = False
+
+<b><i># Sample 2: Length of ID number cannot exceed 10 chars</i></b>
+failed = len(id_number.name) > 10 and True or False
+
+<b><i># Sample 3: ID number must start with the category code</i></b>
+failed = not id_number.name.startswith(self.code) and True or False
+                                </pre>
+                            </div>
+                        </group>
+                    </group>
+                </sheet>
             </form>
         </field>
     </record>