diff --git a/addons/hr_timesheet/models/hr_timesheet.py b/addons/hr_timesheet/models/hr_timesheet.py
index 695bf1f70cd..6801c31ddd7 100644
--- a/addons/hr_timesheet/models/hr_timesheet.py
+++ b/addons/hr_timesheet/models/hr_timesheet.py
@@ -251,7 +251,8 @@ class AccountAnalyticLine(models.Model):
     def _get_view(self, view_id=None, view_type='form', **options):
         """ Set the correct label for `unit_amount`, depending on company UoM """
         arch, view = super()._get_view(view_id, view_type, **options)
-        arch = self._apply_timesheet_label(arch, view_type=view_type)
+        # Use of sudo as the portal user doesn't have access to uom
+        arch = self.sudo()._apply_timesheet_label(arch, view_type=view_type)
         arch = self._apply_time_label(arch, related_model=self._name)
         return arch, view
 
diff --git a/addons/hr_timesheet/tests/__init__.py b/addons/hr_timesheet/tests/__init__.py
index 0d998f7cee1..eaf5a5b7ee1 100644
--- a/addons/hr_timesheet/tests/__init__.py
+++ b/addons/hr_timesheet/tests/__init__.py
@@ -4,3 +4,4 @@
 from . import test_timesheet
 from . import test_performance
 from . import test_project_task_quick_create
+from . import test_portal_timesheet
diff --git a/addons/hr_timesheet/tests/test_portal_timesheet.py b/addons/hr_timesheet/tests/test_portal_timesheet.py
new file mode 100644
index 00000000000..33132f8f0ac
--- /dev/null
+++ b/addons/hr_timesheet/tests/test_portal_timesheet.py
@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+
+from odoo import Command
+from odoo.tests import tagged
+
+from odoo.addons.project.tests.test_project_sharing import TestProjectSharingCommon
+
+@tagged('post_install', '-at_install')
+class TestPortalTimesheet(TestProjectSharingCommon):
+
+    def test_ensure_fields_view_get_access(self):
+        """ Ensure that the method _fields_view_get is accessible without
+            raising an error for all portal users
+        """
+        # A portal collaborator is added to a project to enable the rule analytic.account.analytic.line.timesheet.portal.user
+        self.project_portal.write({
+            'collaborator_ids': [
+                Command.create({'partner_id': self.user_portal.partner_id.id}),
+            ],
+        })
+        for view in ['form', 'tree']:
+            # Ensure that uom.uom records are not present in cache
+            self.env.invalidate_all()
+            # Should not raise any access error
+            self.env['account.analytic.line'].with_user(self.user_portal).get_view(view_type=view)