diff --git a/addons/mrp/i18n/mrp.pot b/addons/mrp/i18n/mrp.pot
index 7cd620376fb..550db41f8ea 100644
--- a/addons/mrp/i18n/mrp.pot
+++ b/addons/mrp/i18n/mrp.pot
@@ -2184,6 +2184,14 @@ msgstr ""
 msgid "It has already been unblocked."
 msgstr ""
 
+#. module: mrp
+#: code:addons/mrp/models/mrp_workorder.py:0
+#, python-format
+msgid ""
+"It is not possible to unplan one single Work Order. You should unplan the "
+"Manufacturing Order instead in order to unplan all the linked operations."
+msgstr ""
+
 #. module: mrp
 #: model:ir.model.fields,field_description:mrp.field_mrp_production__is_planned
 msgid "Its Operations are Planned"
diff --git a/addons/mrp/models/mrp_workorder.py b/addons/mrp/models/mrp_workorder.py
index 003a189de0c..f9f0f2a925e 100644
--- a/addons/mrp/models/mrp_workorder.py
+++ b/addons/mrp/models/mrp_workorder.py
@@ -252,6 +252,9 @@ class MrpWorkorder(models.Model):
             workorder.date_planned_finished = workorder.leave_id.date_to
 
     def _set_dates_planned(self):
+        if self.leave_id and (not self[0].date_planned_start or not self[0].date_planned_finished):
+            raise UserError(_("It is not possible to unplan one single Work Order. "
+                              "You should unplan the Manufacturing Order instead in order to unplan all the linked operations."))
         date_from = self[0].date_planned_start
         date_to = self[0].date_planned_finished
         self.mapped('leave_id').sudo().write({