diff --git a/addons/stock/stock.py b/addons/stock/stock.py
index 2e33ff3ec30..83a94d17f78 100644
--- a/addons/stock/stock.py
+++ b/addons/stock/stock.py
@@ -750,6 +750,13 @@ class stock_picking(osv.osv):
         return res
 
     def _get_pickings(self, cr, uid, ids, context=None):
+        res = set()
+        for move in self.browse(cr, uid, ids, context=context):
+            if move.picking_id:
+                res.add(move.picking_id.id)
+        return list(res)
+
+    def _get_pickings_dates_priority(self, cr, uid, ids, context=None):
         res = set()
         for move in self.browse(cr, uid, ids, context=context):
             if move.picking_id and (not (move.picking_id.min_date < move.date_expected < move.picking_id.max_date) or move.priority > move.picking_id.priority):
@@ -816,12 +823,12 @@ class stock_picking(osv.osv):
                 * Cancelled: has been cancelled, can't be confirmed anymore"""
         ),
         'priority': fields.function(get_min_max_date, multi="min_max_date", fnct_inv=_set_priority, type='selection', selection=procurement.PROCUREMENT_PRIORITIES, string='Priority',
-                                    store={'stock.move': (_get_pickings, ['priority', 'picking_id'], 20)}, states={'done': [('readonly', True)], 'cancel': [('readonly', True)]}, select=1, help="Priority for this picking. Setting manually a value here would set it as priority for all the moves",
+                                    store={'stock.move': (_get_pickings_dates_priority, ['priority', 'picking_id'], 20)}, states={'done': [('readonly', True)], 'cancel': [('readonly', True)]}, select=1, help="Priority for this picking. Setting manually a value here would set it as priority for all the moves",
                                     track_visibility='onchange', required=True),
         'min_date': fields.function(get_min_max_date, multi="min_max_date", fnct_inv=_set_min_date,
-                 store={'stock.move': (_get_pickings, ['date_expected', 'picking_id'], 20)}, type='datetime', states={'done': [('readonly', True)], 'cancel': [('readonly', True)]}, string='Scheduled Date', select=1, help="Scheduled time for the first part of the shipment to be processed. Setting manually a value here would set it as expected date for all the stock moves.", track_visibility='onchange'),
+                 store={'stock.move': (_get_pickings_dates_priority, ['date_expected', 'picking_id'], 20)}, type='datetime', states={'done': [('readonly', True)], 'cancel': [('readonly', True)]}, string='Scheduled Date', select=1, help="Scheduled time for the first part of the shipment to be processed. Setting manually a value here would set it as expected date for all the stock moves.", track_visibility='onchange'),
         'max_date': fields.function(get_min_max_date, multi="min_max_date",
-                 store={'stock.move': (_get_pickings, ['date_expected', 'picking_id'], 20)}, type='datetime', string='Max. Expected Date', select=2, help="Scheduled time for the last part of the shipment to be processed"),
+                 store={'stock.move': (_get_pickings_dates_priority, ['date_expected', 'picking_id'], 20)}, type='datetime', string='Max. Expected Date', select=2, help="Scheduled time for the last part of the shipment to be processed"),
         'date': fields.datetime('Creation Date', help="Creation Date, usually the time of the order", select=True, states={'done': [('readonly', True)], 'cancel': [('readonly', True)]}, track_visibility='onchange'),
         'date_done': fields.datetime('Date of Transfer', help="Date of Completion", states={'done': [('readonly', True)], 'cancel': [('readonly', True)]}, copy=False),
         'move_lines': fields.one2many('stock.move', 'picking_id', 'Internal Moves', states={'done': [('readonly', True)], 'cancel': [('readonly', True)]}, copy=True),