diff --git a/prospect.py b/prospect.py
index 4f65a32..e8b31f6 100644
--- a/prospect.py
+++ b/prospect.py
@@ -12,7 +12,8 @@ class Prospect(ModelSQL, ModelView):
     name = fields.Char('Name')
 
     contact_methods = fields.One2Many(
-        'prospect.contact_method', 'prospect', 'Contact methods')
+        'prospect.contact_method',
+        'prospect', 'Contact methods', required=True)
 
     department = fields.Many2One('sale.department', 'Department')
     city = fields.Many2One('sale.city', 'City',
diff --git a/tests/test_module.py b/tests/test_module.py
index 96e7972..cc89333 100644
--- a/tests/test_module.py
+++ b/tests/test_module.py
@@ -12,5 +12,11 @@ class SaleOpportunityManagementTestCase(ModuleTestCase):
         ProspectTrace = pool.get('sale.prospect_trace')
         self.assertTrue(ProspectTrace.prospect.required)
 
+    @with_transaction()
+    def test_contact_method_en_prospect_es_obligatorio(self):
+        pool = Pool()
+        Prospect = pool.get('sale.prospect')
+        self.assertTrue(Prospect.contact_methods.required)
+
 
 del ModuleTestCase