diff --git a/erpnext/manufacturing/doctype/job_card/job_card.js b/erpnext/manufacturing/doctype/job_card/job_card.js
index 9ee5e80f88d..1b8e4d59d7b 100644
--- a/erpnext/manufacturing/doctype/job_card/job_card.js
+++ b/erpnext/manufacturing/doctype/job_card/job_card.js
@@ -109,6 +109,14 @@ frappe.ui.form.on('Job Card', {
 		});
 	},
 
+	validate: function(frm) {
+		if ((!frm.doc.time_logs || !frm.doc.time_logs.length) && frm.doc.started_time) {
+			frm.set_value('started_time' , '');
+			frm.set_value('job_started', 0);
+			frm.set_value('current_time' , 0);
+		}
+	},
+
 	make_dashboard: function(frm) {
 		if(frm.doc.__islocal)
 			return;
@@ -209,5 +217,10 @@ frappe.ui.form.on('Job Card', {
 frappe.ui.form.on('Job Card Time Log', {
 	completed_qty: function(frm) {
 		frm.events.set_total_completed_qty(frm);
+	},
+
+	to_time: function(frm) {
+		frm.set_value('job_started', 0);
+		frm.set_value('started_time', '');
 	}
 })
\ No newline at end of file
diff --git a/erpnext/manufacturing/doctype/job_card/job_card.py b/erpnext/manufacturing/doctype/job_card/job_card.py
index 7c648c79014..4c1ab7479fb 100644
--- a/erpnext/manufacturing/doctype/job_card/job_card.py
+++ b/erpnext/manufacturing/doctype/job_card/job_card.py
@@ -5,7 +5,7 @@
 from __future__ import unicode_literals
 import frappe
 from frappe import _
-from frappe.utils import flt, time_diff_in_hours, get_datetime, time_diff
+from frappe.utils import flt, time_diff_in_hours, get_datetime, time_diff, get_link_to_form
 from frappe.model.mapper import get_mapped_doc
 from frappe.model.document import Document
 
@@ -90,11 +90,15 @@ class JobCard(Document):
 
 	def validate_job_card(self):
 		if not self.time_logs:
-			frappe.throw(_("Time logs are required for job card {0}").format(self.name))
+			frappe.throw(_("Time logs are required for {0} {1}")
+				.format(frappe.bold("Job Card"), get_link_to_form("Job Card", self.name)))
 
 		if self.for_quantity and self.total_completed_qty != self.for_quantity:
-			frappe.throw(_("The total completed qty({0}) must be equal to qty to manufacture({1})"
-				.format(frappe.bold(self.total_completed_qty),frappe.bold(self.for_quantity))))
+			total_completed_qty = frappe.bold(_("Total Completed Qty"))
+			qty_to_manufacture = frappe.bold(_("Qty to Manufacture"))
+
+			frappe.throw(_("The {0} ({1}) must be equal to {2} ({3})"
+				.format(total_completed_qty, frappe.bold(self.total_completed_qty), qty_to_manufacture,frappe.bold(self.for_quantity))))
 
 	def update_work_order(self):
 		if not self.work_order:
diff --git a/erpnext/manufacturing/doctype/work_order/work_order.js b/erpnext/manufacturing/doctype/work_order/work_order.js
index 1989c10c394..2d8d75d1f94 100644
--- a/erpnext/manufacturing/doctype/work_order/work_order.js
+++ b/erpnext/manufacturing/doctype/work_order/work_order.js
@@ -232,6 +232,8 @@ frappe.ui.form.on("Work Order", {
 			});
 		}, __("Job Card"), __("Create"));
 
+		dialog.fields_dict["operations"].grid.wrapper.find('.grid-add-row').hide();
+
 		var pending_qty = 0;
 		frm.doc.operations.forEach(data => {
 			if(data.completed_qty != frm.doc.qty) {