diff --git a/resource_multi_week_work_time_from_contracts/__manifest__.py b/resource_multi_week_work_time_from_contracts/__manifest__.py
index 5c873ce1..0597db75 100644
--- a/resource_multi_week_work_time_from_contracts/__manifest__.py
+++ b/resource_multi_week_work_time_from_contracts/__manifest__.py
@@ -18,7 +18,4 @@
         "resource_work_time_from_contracts",
     ],
     "auto_install": True,
-    "data": [
-        "views/hr_contract_views.xml",
-    ],
 }
diff --git a/resource_multi_week_work_time_from_contracts/models/hr_contract.py b/resource_multi_week_work_time_from_contracts/models/hr_contract.py
new file mode 100644
index 00000000..c7252be8
--- /dev/null
+++ b/resource_multi_week_work_time_from_contracts/models/hr_contract.py
@@ -0,0 +1,15 @@
+# SPDX-FileCopyrightText: 2024 Coop IT Easy SC
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+from odoo import fields, models
+
+
+class HrContract(models.Model):
+    _inherit = "hr.contract"
+
+    # Add a domain.
+    resource_calendar_id = fields.Many2one(
+        "resource.calendar",
+        domain="[('parent_calendar_id', '=', False)]",
+    )
diff --git a/resource_multi_week_work_time_from_contracts/views/hr_contract_views.xml b/resource_multi_week_work_time_from_contracts/views/hr_contract_views.xml
deleted file mode 100644
index d5ba4d12..00000000
--- a/resource_multi_week_work_time_from_contracts/views/hr_contract_views.xml
+++ /dev/null
@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<!--
-SPDX-FileCopyrightText: 2024 Coop IT Easy SC
-
-SPDX-License-Identifier: AGPL-3.0-or-later
--->
-<odoo>
-    <record model="ir.ui.view" id="hr_contract_view_form">
-        <field name="name">hr.contract.form</field>
-        <field name="model">hr.contract</field>
-        <field name="inherit_id" ref="hr_contract.hr_contract_view_form" />
-        <field name="arch" type="xml">
-            <field name="resource_calendar_id" position="attributes">
-                <attribute
-                    name="domain"
-                >[('parent_calendar_id', '=', False)]</attribute>
-            </field>
-        </field>
-    </record>
-</odoo>