Delivery note to packing slip mapping

erpnext/stock/doctype/delivery_note/delivery_note.js

@@ -118,10 +118,10 @@ cur_frm.fields_dict['transporter_name'].get_query = function(doc) {
 }
 
 cur_frm.cscript['Make Packing Slip'] = function() {
-	n = frappe.model.make_new_doc_and_get_name('Packing Slip');
+	frappe.model.open_mapped_doc({
-	ps = locals["Packing Slip"][n];
+		method: "erpnext.stock.doctype.delivery_note.delivery_note.make_packing_slip",
-	ps.delivery_note = cur_frm.doc.name;
+		frm: cur_frm
-	loaddoc('Packing Slip', n);
+	})
 }
 
 var set_print_hide= function(doc, cdt, cdn){

erpnext/stock/doctype/delivery_note/delivery_note.py

@@ -346,3 +346,19 @@ def make_installation_note(source_name, target_doc=None):
 	}, target_doc)
 
 	return doclist
+
+@frappe.whitelist()
+def make_packing_slip(source_name, target_doc=None):
+	doclist = get_mapped_doc("Delivery Note", source_name, 	{
+		"Delivery Note": {
+			"doctype": "Packing Slip",
+			"field_map": {
+				"name": "delivery_note"
+			},
+			"validation": {
+				"docstatus": ["=", 0]
+			}
+		}
+	}, target_doc)
+
+	return doclist

erpnext/stock/doctype/material_request/material_request.py

@@ -48,7 +48,7 @@ class MaterialRequest(BuyingController):
 
 	def validate_schedule_date(self):
 		for d in self.get('indent_details'):
-			if d.schedule_date < self.transaction_date:
+			if d.schedule_date and d.schedule_date < self.transaction_date:
 				frappe.throw(_("Expected Date cannot be before Material Request Date"))
 
 	# Validate