diff --git a/l10n_be_cooperator_national_number/models/res_partner.py b/l10n_be_cooperator_national_number/models/res_partner.py
index fda7f1225..47550c8d2 100644
--- a/l10n_be_cooperator_national_number/models/res_partner.py
+++ b/l10n_be_cooperator_national_number/models/res_partner.py
@@ -2,25 +2,41 @@
 #
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
-from odoo import models
+from odoo import api, models
 
 
 class ResPartner(models.Model):
     _inherit = "res.partner"
 
+    @api.model
+    def get_be_national_register_number_id_category(self):
+        return self.env.ref(
+            "l10n_be_partner_identification.l10n_be_national_registry_number_category"
+        )
+
+    def get_be_national_register_number_id_number(self):
+        self.ensure_one()
+        belgian_cat = self.get_be_national_register_number_id_category()
+        return self.env["res.partner.id_number"].search(
+            [
+                ("partner_id", "=", self.id),
+                ("category_id", "=", belgian_cat.id),
+            ],
+            limit=1,
+        )
+
+    def get_be_national_register_number(self):
+        self.ensure_one()
+        id_number = self.get_be_national_register_number_id_number()
+        if id_number:
+            return id_number.name
+        return None
+
     def update_belgian_national_number(self, national_number):
         self.ensure_one()
         result = None
         if national_number:
-            belgian_cat = self.env.ref(
-                "l10n_be_partner_identification.l10n_be_national_registry_number_category"
-            )
-            existing = self.env["res.partner.id_number"].search(
-                [
-                    ("partner_id", "=", self.id),
-                    ("category_id", "=", belgian_cat.id),
-                ]
-            )
+            existing = self.get_be_national_register_number_id_number()
             # Update
             if existing:
                 existing.name = national_number
@@ -29,7 +45,7 @@ def update_belgian_national_number(self, national_number):
             else:
                 values = {
                     "name": national_number,
-                    "category_id": belgian_cat.id,
+                    "category_id": self.get_be_national_register_number_id_category().id,
                     "partner_id": self.id,
                 }
                 result = self.env["res.partner.id_number"].create(values)
diff --git a/l10n_be_cooperator_national_number/models/subscription_request.py b/l10n_be_cooperator_national_number/models/subscription_request.py
index ba2747e72..39c50a9c1 100644
--- a/l10n_be_cooperator_national_number/models/subscription_request.py
+++ b/l10n_be_cooperator_national_number/models/subscription_request.py
@@ -31,27 +31,11 @@ def _compute_require_national_number(self):
             self.company_id.require_national_number and not self.is_company
         )
 
-    @api.model
-    def _get_be_national_register_number_id_category(self):
-        return self.env.ref(
-            "l10n_be_partner_identification.l10n_be_national_registry_number_category"
-        )
-
-    @api.model
-    def get_national_number_from_partner(self, partner):
-        national_number_id_category = (
-            self._get_be_national_register_number_id_category()
-        )
-        national_number = partner.id_numbers.filtered(
-            lambda rec: rec.category_id.id == national_number_id_category.id
-        )
-        return national_number.name
-
     @api.model
     def check_be_national_register_number(self, national_number):
-        national_number_id_category = (
-            self._get_be_national_register_number_id_category()
-        )
+        national_number_id_category = self.env[
+            "res.partner"
+        ].get_be_national_register_number_id_category()
         # this function checks the value of id_number.name, not id_number
         # directly.
         id_number = namedtuple("id_number", ("name"))(national_number)
@@ -71,5 +55,5 @@ def validate_subscription_request(self):
 
     def set_person_info(self, partner):
         super().set_person_info(partner)
-        self.national_number = self.get_national_number_from_partner(partner)
+        self.national_number = partner.get_be_national_register_number()
         return True
diff --git a/l10n_be_cooperator_national_number/readme/newsfragments/134.feature.rst b/l10n_be_cooperator_national_number/readme/newsfragments/134.feature.rst
new file mode 100644
index 000000000..2f3ffee6c
--- /dev/null
+++ b/l10n_be_cooperator_national_number/readme/newsfragments/134.feature.rst
@@ -0,0 +1,2 @@
+Added several convenience functions to get national number values on
+``res.partner``.