[FIX] mrp: date expected

- Create a MO
- Change the date 'Deadline Start'

The corresponding 'Expected Date' on the stock moves is not updated with
the new value.

opw-1828631

addons/mrp/models/mrp_production.py

@@ -263,6 +263,17 @@ class MrpProduction(models.Model):
         self.location_src_id = self.picking_type_id.default_location_src_id.id or location.id
         self.location_dest_id = self.picking_type_id.default_location_dest_id.id or location.id
 
+    @api.multi
+    def write (self, vals):
+        res = super(MrpProduction, self).write(vals)
+        if 'date_planned_start' in vals:
+            moves = (self.mapped('move_raw_ids') + self.mapped('move_finished_ids')).filtered(
+                lambda r: r.state not in ['done', 'cancel'])
+            moves.write({
+                'date_expected': vals['date_planned_start'],
+            })
+        return res
+
     @api.model
     def create(self, values):
         if not values.get('name', False) or values['name'] == _('New'):