fix: allow on submit for the delivery date field not working for sales order

erpnext/selling/doctype/sales_order_item/sales_order_item.json

@@ -150,6 +150,7 @@
    "width": "300px"
   },
   {
+   "allow_on_submit": 1,
    "columns": 2,
    "depends_on": "eval: !parent.skip_delivery_note",
    "fieldname": "delivery_date",
@@ -757,8 +758,7 @@
  ],
  "idx": 1,
  "istable": 1,
- "links": [],
- "modified": "2020-03-05 14:20:28.085117",
+ "modified": "2020-05-22 12:40:01.696076",
  "modified_by": "Administrator",
  "module": "Selling",
  "name": "Sales Order Item",