diff --git a/models/shipcloud_pickup.py b/models/shipcloud_pickup.py
index 90cffc4..12ebe1c 100644
--- a/models/shipcloud_pickup.py
+++ b/models/shipcloud_pickup.py
@@ -19,9 +19,11 @@ class SCPickup(models.Model):
     # address from where to pick up
     address = fields.Many2one('res.partner', string='Pick-up address', required=True)
     # earliest pick-up time
-    earliest = fields.Datetime('Earliest', required=True, default=fields.Datetime.now())
+    earliest = fields.Datetime('Earliest', required=True, default=fields.Datetime.now(),
+                               readonly=True, states={'draft': [('readonly', False)]})
     # latest pick-up time
-    latest = fields.Datetime('Latest', required=True)
+    latest = fields.Datetime('Latest', required=True,
+                             readonly=True, states={'draft': [('readonly', False)]})
     # draft: not yet requested from shipcloud; confirmed: confirmed by shipcloud
     state = fields.Selection([('draft', 'Draft'), ('confirmed', 'Confirmed'), ('done','Done')],
                              string='Status', default='draft', readonly=True, required=True, copy=False)