diff --git a/hr_employee_stats_sheet/i18n/fr.po b/hr_employee_stats_sheet/i18n/fr.po
index 9efd36a..609a751 100644
--- a/hr_employee_stats_sheet/i18n/fr.po
+++ b/hr_employee_stats_sheet/i18n/fr.po
@@ -69,7 +69,7 @@ msgstr "Indiquer le coefficient multiplicateur à appliquer sur les heures suppl
 msgid "Choose the recovery type."
 msgstr ""
 "Sélectionner le type de congé utilisé pour générer des allocations de "
-"récupération"
+"récupération. Le type de congé doit accepter les allocations négatives et être pris à l'heure."
 
 #. module: hr_employee_stats_sheet
 #: model_terms:ir.ui.view,arch_db:hr_employee_stats_sheet.res_config_settings_view_form
diff --git a/hr_employee_stats_sheet/models/hr_timesheet_sheet.py b/hr_employee_stats_sheet/models/hr_timesheet_sheet.py
index ca82407..681862c 100644
--- a/hr_employee_stats_sheet/models/hr_timesheet_sheet.py
+++ b/hr_employee_stats_sheet/models/hr_timesheet_sheet.py
@@ -190,7 +190,10 @@ class HrTimesheetSheet(models.Model):
             raise UserError(
                 _("Employe not defined for the timesheet sheet or recovery type not defined in settings") 
             )
-
+        if recovery_type_id.request_unit != 'hour' or not recovery_type_id.allows_negative:
+            raise UserError(
+                _("The recovery type must be set to 'Hours' and allow negative leaves in the settings")
+            )
         # check if allocation already exists for this timesheet sheet, if yes, refuse it
         allocations = (
             self.env["hr.leave.allocation"]
@@ -217,7 +220,6 @@ class HrTimesheetSheet(models.Model):
             data_days = recovery_type_id.get_employees_days([employee_id.id])[employee_id.id]
             total_recovery_type_leaves = data_days.get(recovery_type_id.id,{})
             total_virtual_remaining_recovery_type_leaves = total_recovery_type_leaves.get('virtual_remaining_leaves', 0)
-            # TODO vérifier si ça marche avec un recovery type dont l'unité de mesure est le jour
             # add the recovery hours to the total remaining leaves recovery type, and check if the limit of recovery hours is exceeded
             exceeded_hours = total_virtual_remaining_recovery_type_leaves + recovery_hours - max_allowed_recovery_hours
             # if limit recovery hours is exceeded, don't create a new allocation
diff --git a/hr_employee_stats_sheet/models/res_config.py b/hr_employee_stats_sheet/models/res_config.py
index c54d034..da3e403 100644
--- a/hr_employee_stats_sheet/models/res_config.py
+++ b/hr_employee_stats_sheet/models/res_config.py
@@ -9,6 +9,7 @@ class ResConfigSettings(models.TransientModel):
         related="company_id.recovery_type_id",
         string="Leave recovery type",
         readonly=False,
+        domain="[('request_unit', '=', 'hour'), ('allows_negative', '=', True)]",
     )
 
     coef = fields.Float(
diff --git a/hr_employee_stats_sheet/tests/test_employee_stats.py b/hr_employee_stats_sheet/tests/test_employee_stats.py
index 0aff8fe..2594b3b 100644
--- a/hr_employee_stats_sheet/tests/test_employee_stats.py
+++ b/hr_employee_stats_sheet/tests/test_employee_stats.py
@@ -14,6 +14,7 @@ class TestHrEmployeeStatsRecovery(TransactionCase):
         self.recovery_type = self.env['hr.leave.type'].create({
             'name': 'Recovery',
             'request_unit': 'hour',
+            'allows_negative': True,
         })
         self.employee = self.env['hr.employee'].create({
             'name': 'Camille',
@@ -63,6 +64,15 @@ class TestHrEmployeeStatsRecovery(TransactionCase):
             stat._compute_hours()
             yield stat
 
+    def test_invalide_recovery_type(self):
+        start_date = date.today() - timedelta(days=date.today().weekday() + 7)  # lundi de la semaine dernière
+        self.recovery_type.request_unit = 'day'
+        self.recovery_type.allows_negative = False
+        timesheet_sheet = self._create_timesheet_sheet(start_date)
+        self.env.company.recovery_type_id = self.recovery_type
+        with self.assertRaises(UserError):
+            timesheet_sheet.action_generate_recovery_allocation()
+
     def test_no_recovery_hours(self):
         start_date = date.today() - timedelta(days=date.today().weekday() + 7)  # lundi de la semaine dernière
         timesheet_sheet = self._create_timesheet_sheet(start_date)