diff --git a/erpnext/hr/doctype/leave_allocation/leave_allocation.json b/erpnext/hr/doctype/leave_allocation/leave_allocation.json
index 654a82d..8e63bcc 100644
--- a/erpnext/hr/doctype/leave_allocation/leave_allocation.json
+++ b/erpnext/hr/doctype/leave_allocation/leave_allocation.json
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\ No newline at end of file
diff --git a/erpnext/hr/doctype/leave_application/leave_application.py b/erpnext/hr/doctype/leave_application/leave_application.py
index 1f49310..2278036 100755
--- a/erpnext/hr/doctype/leave_application/leave_application.py
+++ b/erpnext/hr/doctype/leave_application/leave_application.py
@@ -88,15 +88,17 @@
 			self.validate_back_dated_application()
 
 	def validate_dates_across_allocation(self):
-		def _get_leave_alloction_record(date):
+		if frappe.db.get_value("Leave Type", self.leave_type, "allow_negative"):
+			return
+		def _get_leave_allocation_record(date):
 			allocation = frappe.db.sql("""select name from `tabLeave Allocation`
 				where employee=%s and leave_type=%s and docstatus=1
 				and %s between from_date and to_date""", (self.employee, self.leave_type, date))
 
 			return allocation and allocation[0][0]
 
-		allocation_based_on_from_date = _get_leave_alloction_record(self.from_date)
-		allocation_based_on_to_date = _get_leave_alloction_record(self.to_date)
+		allocation_based_on_from_date = _get_leave_allocation_record(self.from_date)
+		allocation_based_on_to_date = _get_leave_allocation_record(self.to_date)
 
 		if not (allocation_based_on_from_date or allocation_based_on_to_date):
 			frappe.throw(_("Application period cannot be outside leave allocation period"))
diff --git a/erpnext/hr/doctype/leave_period/leave_period.js b/erpnext/hr/doctype/leave_period/leave_period.js
index 19633e2..d4935cf 100644
--- a/erpnext/hr/doctype/leave_period/leave_period.js
+++ b/erpnext/hr/doctype/leave_period/leave_period.js
@@ -4,6 +4,11 @@
 frappe.ui.form.on('Leave Period', {
 	refresh: (frm)=>{
 		frm.set_df_property("grant_leaves", "hidden", frm.doc.__islocal ? 1:0);
+		if(!frm.is_new()) {
+			frm.add_custom_button(__('Grant Leaves'), function () {
+				frm.trigger("grant_leaves");
+			});
+		}
 	},
 	from_date: (frm)=>{
 		if (frm.doc.from_date && !frm.doc.to_date) {
@@ -11,19 +16,6 @@
 			frm.set_value("to_date", frappe.datetime.add_days(a_year_from_start, -1));
 		}
 	},
-	grant: (frm)=>{
-		frappe.call({
-			doc: frm.doc,
-			method: "grant_leave_allocation",
-			callback: function(r) {
-				if(!r.exc){
-					frm.reload_doc();
-				}
-			},
-			freeze: true,
-			freeze_message: __("Grant allocations......")
-		})
-	},
 	onload: (frm) => {
 		frm.set_query("department", function() {
 			return {
@@ -32,5 +24,70 @@
 				}
 			}
 		})
+	},
+	grant_leaves: function(frm) {
+		var d = new frappe.ui.Dialog({
+			title: __('Grant Leaves'),
+			fields: [
+				{
+					"label": "Filter Employees By (Optional)",
+					"fieldname": "sec_break",
+					"fieldtype": "Section Break",
+				},
+				{
+					"label": "Employee Grade",
+					"fieldname": "grade",
+					"fieldtype": "Link",
+					"options": "Employee Grade"
+				},
+				{
+					"label": "Department",
+					"fieldname": "department",
+					"fieldtype": "Link",
+					"options": "Department"
+				},
+				{
+					"fieldname": "col_break",
+					"fieldtype": "Column Break",
+				},
+				{
+					"label": "Designation",
+					"fieldname": "designation",
+					"fieldtype": "Link",
+					"options": "Designation"
+				},
+				{
+					"label": "Employee",
+					"fieldname": "employee",
+					"fieldtype": "Link",
+					"options": "Employee"
+				},
+				{
+					"fieldname": "sec_break",
+					"fieldtype": "Section Break",
+				},
+				{
+					"label": "Add unused leaves from previous allocations",
+					"fieldname": "carry_forward_leaves",
+					"fieldtype": "Check"
+				}
+			],
+			primary_action: function() {
+				var data = d.get_values();
+
+				frappe.call({
+					doc: frm.doc,
+					method: "grant_leave_allocation",
+					args: data,
+					callback: function(r) {
+						if(!r.exc) {
+							d.hide();
+						}
+					}
+				});
+			},
+			primary_action_label: __('Grant')
+		});
+		d.show();
 	}
 });
diff --git a/erpnext/hr/doctype/leave_period/leave_period.json b/erpnext/hr/doctype/leave_period/leave_period.json
index b184bef..ed0c57a 100644
--- a/erpnext/hr/doctype/leave_period/leave_period.json
+++ b/erpnext/hr/doctype/leave_period/leave_period.json
@@ -1,585 +1,294 @@
 {
- "allow_copy": 0,
- "allow_guest_to_view": 0,
- "allow_import": 1,
- "allow_rename": 1,
- "autoname": "HR-LPR-.####",
- "beta": 0,
- "creation": "2018-04-13 15:20:52.864288",
- "custom": 0,
- "docstatus": 0,
- "doctype": "DocType",
- "document_type": "",
- "editable_grid": 1,
- "engine": "InnoDB",
+ "allow_copy": 0, 
+ "allow_guest_to_view": 0, 
+ "allow_import": 1, 
+ "allow_rename": 1, 
+ "autoname": "HR-LPR-.####", 
+ "beta": 0, 
+ "creation": "2018-04-13 15:20:52.864288", 
+ "custom": 0, 
+ "docstatus": 0, 
+ "doctype": "DocType", 
+ "document_type": "", 
+ "editable_grid": 1, 
+ "engine": "InnoDB", 
  "fields": [
   {
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-   "fieldtype": "Date",
-   "hidden": 0,
-   "ignore_user_permissions": 0,
-   "ignore_xss_filter": 0,
-   "in_filter": 0,
-   "in_global_search": 0,
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-   "in_standard_filter": 0,
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+   "fieldtype": "Date", 
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+   "ignore_user_permissions": 0, 
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+   "in_filter": 0, 
+   "in_global_search": 0, 
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+   "in_standard_filter": 0, 
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+   "fieldtype": "Date", 
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+   "label": "To Date", 
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-   "collapsible": 0,
-   "columns": 0,
-   "fieldname": "grant",
-   "fieldtype": "Button",
-   "hidden": 0,
-   "ignore_user_permissions": 0,
-   "ignore_xss_filter": 0,
-   "in_filter": 0,
-   "in_global_search": 0,
-   "in_list_view": 0,
-   "in_standard_filter": 0,
-   "label": "Grant",
-   "length": 0,
-   "no_copy": 0,
-   "permlevel": 0,
-   "precision": "",
-   "print_hide": 0,
-   "print_hide_if_no_value": 0,
-   "read_only": 0,
-   "remember_last_selected_value": 0,
-   "report_hide": 0,
-   "reqd": 0,
-   "search_index": 0,
-   "set_only_once": 0,
-   "translatable": 0,
-   "unique": 0
-  },
-  {
-   "allow_bulk_edit": 0,
-   "allow_in_quick_entry": 0,
-   "allow_on_submit": 0,
-   "bold": 0,
-   "collapsible": 0,
-   "columns": 0,
-   "fieldname": "column_break_12",
-   "fieldtype": "Column Break",
-   "hidden": 0,
-   "ignore_user_permissions": 0,
-   "ignore_xss_filter": 0,
-   "in_filter": 0,
-   "in_global_search": 0,
-   "in_list_view": 0,
-   "in_standard_filter": 0,
-   "length": 0,
-   "no_copy": 0,
-   "permlevel": 0,
-   "precision": "",
-   "print_hide": 0,
-   "print_hide_if_no_value": 0,
-   "read_only": 0,
-   "remember_last_selected_value": 0,
-   "report_hide": 0,
-   "reqd": 0,
-   "search_index": 0,
-   "set_only_once": 0,
-   "translatable": 0,
-   "unique": 0
-  },
-  {
-   "allow_bulk_edit": 0,
-   "allow_in_quick_entry": 0,
-   "allow_on_submit": 0,
-   "bold": 0,
-   "collapsible": 0,
-   "columns": 0,
-   "fieldname": "carry_forward_leaves",
-   "fieldtype": "Check",
-   "hidden": 0,
-   "ignore_user_permissions": 0,
-   "ignore_xss_filter": 0,
-   "in_filter": 0,
-   "in_global_search": 0,
-   "in_list_view": 0,
-   "in_standard_filter": 0,
-   "label": "Carry Forward Leaves",
-   "length": 0,
-   "no_copy": 0,
-   "permlevel": 0,
-   "precision": "",
-   "print_hide": 0,
-   "print_hide_if_no_value": 0,
-   "read_only": 0,
-   "remember_last_selected_value": 0,
-   "report_hide": 0,
-   "reqd": 0,
-   "search_index": 0,
-   "set_only_once": 0,
-   "translatable": 0,
+   "allow_bulk_edit": 0, 
+   "allow_in_quick_entry": 0, 
+   "allow_on_submit": 0, 
+   "bold": 0, 
+   "collapsible": 0, 
+   "columns": 0, 
+   "fieldname": "optional_holiday_list", 
+   "fieldtype": "Link", 
+   "hidden": 0, 
+   "ignore_user_permissions": 0, 
+   "ignore_xss_filter": 0, 
+   "in_filter": 0, 
+   "in_global_search": 0, 
+   "in_list_view": 0, 
+   "in_standard_filter": 0, 
+   "label": "Holiday List for Optional Leave", 
+   "length": 0, 
+   "no_copy": 0, 
+   "options": "Holiday List", 
+   "permlevel": 0, 
+   "precision": "", 
+   "print_hide": 0, 
+   "print_hide_if_no_value": 0, 
+   "read_only": 0, 
+   "remember_last_selected_value": 0, 
+   "report_hide": 0, 
+   "reqd": 0, 
+   "search_index": 0, 
+   "set_only_once": 0, 
+   "translatable": 0, 
    "unique": 0
   }
- ],
- "has_web_view": 0,
- "hide_heading": 0,
- "hide_toolbar": 0,
- "idx": 0,
- "image_view": 0,
- "in_create": 0,
- "is_submittable": 0,
- "issingle": 0,
- "istable": 0,
- "max_attachments": 0,
- "modified": "2018-07-02 08:15:51.853668",
- "modified_by": "Administrator",
- "module": "HR",
- "name": "Leave Period",
- "name_case": "",
- "owner": "Administrator",
+ ], 
+ "has_web_view": 0, 
+ "hide_heading": 0, 
+ "hide_toolbar": 0, 
+ "idx": 0, 
+ "image_view": 0, 
+ "in_create": 0, 
+ "is_submittable": 0, 
+ "issingle": 0, 
+ "istable": 0, 
+ "max_attachments": 0, 
+ "modified": "2018-07-27 13:36:08.458731", 
+ "modified_by": "Administrator", 
+ "module": "HR", 
+ "name": "Leave Period", 
+ "name_case": "", 
+ "owner": "Administrator", 
  "permissions": [
   {
-   "amend": 0,
-   "cancel": 0,
-   "create": 1,
-   "delete": 1,
-   "email": 1,
-   "export": 1,
-   "if_owner": 0,
-   "import": 0,
-   "permlevel": 0,
-   "print": 1,
-   "read": 1,
-   "report": 1,
-   "role": "System Manager",
-   "set_user_permissions": 0,
-   "share": 1,
-   "submit": 0,
+   "amend": 0, 
+   "cancel": 0, 
+   "create": 1, 
+   "delete": 1, 
+   "email": 1, 
+   "export": 1, 
+   "if_owner": 0, 
+   "import": 0, 
+   "permlevel": 0, 
+   "print": 1, 
+   "read": 1, 
+   "report": 1, 
+   "role": "System Manager", 
+   "set_user_permissions": 0, 
+   "share": 1, 
+   "submit": 0, 
    "write": 1
-  },
+  }, 
   {
-   "amend": 0,
-   "cancel": 0,
-   "create": 1,
-   "delete": 1,
-   "email": 1,
-   "export": 1,
-   "if_owner": 0,
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-   "permlevel": 0,
-   "print": 1,
-   "read": 1,
-   "report": 1,
-   "role": "HR Manager",
-   "set_user_permissions": 0,
-   "share": 1,
-   "submit": 0,
+   "amend": 0, 
+   "cancel": 0, 
+   "create": 1, 
+   "delete": 1, 
+   "email": 1, 
+   "export": 1, 
+   "if_owner": 0, 
+   "import": 0, 
+   "permlevel": 0, 
+   "print": 1, 
+   "read": 1, 
+   "report": 1, 
+   "role": "HR Manager", 
+   "set_user_permissions": 0, 
+   "share": 1, 
+   "submit": 0, 
    "write": 1
-  },
+  }, 
   {
-   "amend": 0,
-   "cancel": 0,
-   "create": 1,
-   "delete": 1,
-   "email": 1,
-   "export": 1,
-   "if_owner": 0,
-   "import": 0,
-   "permlevel": 0,
-   "print": 1,
-   "read": 1,
-   "report": 1,
-   "role": "HR User",
-   "set_user_permissions": 0,
-   "share": 1,
-   "submit": 0,
+   "amend": 0, 
+   "cancel": 0, 
+   "create": 1, 
+   "delete": 1, 
+   "email": 1, 
+   "export": 1, 
+   "if_owner": 0, 
+   "import": 0, 
+   "permlevel": 0, 
+   "print": 1, 
+   "read": 1, 
+   "report": 1, 
+   "role": "HR User", 
+   "set_user_permissions": 0, 
+   "share": 1, 
+   "submit": 0, 
    "write": 1
   }
- ],
- "quick_entry": 0,
- "read_only": 0,
- "read_only_onload": 0,
- "show_name_in_global_search": 0,
- "sort_field": "modified",
- "sort_order": "DESC",
- "track_changes": 1,
- "track_seen": 0,
+ ], 
+ "quick_entry": 0, 
+ "read_only": 0, 
+ "read_only_onload": 0, 
+ "show_name_in_global_search": 0, 
+ "sort_field": "modified", 
+ "sort_order": "DESC", 
+ "track_changes": 1, 
+ "track_seen": 0, 
  "track_views": 0
 }
\ No newline at end of file
diff --git a/erpnext/hr/doctype/leave_period/leave_period.py b/erpnext/hr/doctype/leave_period/leave_period.py
index 6a8e3bc..15fa8d6 100644
--- a/erpnext/hr/doctype/leave_period/leave_period.py
+++ b/erpnext/hr/doctype/leave_period/leave_period.py
@@ -8,91 +8,107 @@
 from frappe.utils import getdate, cstr
 from frappe.model.document import Document
 from erpnext.hr.utils import validate_overlap, get_employee_leave_policy
+from frappe.utils.background_jobs import enqueue
+from six import iteritems
 
 class LeavePeriod(Document):
-	def get_employees(self):
+	def get_employees(self, args):
 		conditions, values = [], []
-		for field in ["grade", "designation", "department"]:
-			if self.get(field):
+		for field, value in iteritems(args):
+			if value:
 				conditions.append("{0}=%s".format(field))
-				values.append(self.get(field))
+				values.append(value)
 
 		condition_str = " and " + " and ".join(conditions) if len(conditions) else ""
 
-		e = frappe.db.sql("select name from tabEmployee where status='Active' {condition}"
+		employees = frappe.db.sql_list("select name from tabEmployee where status='Active' {condition}"
 			.format(condition=condition_str), tuple(values))
 
-		return e
+		return employees
 
 	def validate(self):
 		self.validate_dates()
 		validate_overlap(self, self.from_date, self.to_date, self.company)
 
-	def grant_leave_allocation(self):
-		if self.employee:
-			leave_allocation = []
-			leave_allocation = self.grant_leave_alloc(self.employee, leave_allocation)
-			if leave_allocation:
-				self.print_message(leave_allocation)
-		else:
-			self.grant_leave_alloc_for_employees()
-
-	def grant_leave_alloc_for_employees(self):
-		employees = self.get_employees()
-		if employees:
-			leave_allocations = []
-			for employee in employees:
-				leave_allocations = self.grant_leave_alloc(cstr(employee[0]), leave_allocations)
-			if leave_allocations:
-				self.print_message(leave_allocations)
-		else:
-			frappe.msgprint(_("No employee found"))
-
-	def grant_leave_alloc(self, employee, leave_allocations):
-		self.validate_allocation_exists(employee)
-		leave_policy = get_employee_leave_policy(employee)
-		if leave_policy:
-			for leave_policy_detail in leave_policy.leave_policy_details:
-				if not frappe.db.get_value("Leave Type", leave_policy_detail.leave_type, "is_lwp"):
-					leave_allocations.append(self.create_leave_allocation(employee, leave_policy_detail.leave_type, leave_policy_detail.annual_allocation))
-		return leave_allocations
-
-	def validate_allocation_exists(self, employee):
-		leave_alloc = frappe.db.exists({
-				"doctype": "Leave Allocation",
-				"employee": employee,
-				"leave_period": self.name,
-				"docstatus": 1})
-		if leave_alloc:
-			frappe.throw(_("Employee {0} already have Leave Allocation {1} for this period").format(employee, leave_alloc[0][0])\
-			+ """ <b><a href="#Form/Leave Allocation/{0}">{0}</a></b>""".format(leave_alloc[0][0]))
-
 	def validate_dates(self):
 		if getdate(self.from_date) >= getdate(self.to_date):
 			frappe.throw(_("To date can not be equal or less than from date"))
 
-	def create_leave_allocation(self, employee, leave_type, new_leaves_allocated):
-		allocation = frappe.new_doc("Leave Allocation")
-		allocation.employee = employee
-		allocation.employee_name = frappe.db.get_value("Employee", employee, "employee_name")
-		allocation.leave_type = leave_type
-		allocation.from_date = self.from_date
-		allocation.to_date = self.to_date
-		# Earned Leaves and Compensatory Leaves are allocated by scheduler, initially allocate 0
-		is_earned_leave, is_compensatory = frappe.db.get_value("Leave Type", leave_type, ["is_earned_leave", "is_compensatory"])
-		if is_earned_leave == 1 or is_compensatory == 1:
-			new_leaves_allocated = 0
-		allocation.new_leaves_allocated = new_leaves_allocated
-		allocation.leave_period = self.name
-		if self.carry_forward_leaves:
-			if frappe.db.get_value("Leave Type", leave_type, "is_carry_forward"):
-				allocation.carry_forward = self.carry_forward_leaves
-		allocation.save(ignore_permissions = True)
-		allocation.submit()
-		return allocation.name
+
+	def grant_leave_allocation(self, grade=None, department=None, designation=None,
+			employee=None, carry_forward_leaves=0):
+		employees = self.get_employees({
+			"grade": grade,
+			"department": department, 
+			"designation": designation, 
+			"name": employee
+		})
+
+		if employees:
+			if len(employees) > 20:
+				frappe.enqueue(grant_leave_alloc_for_employees, timeout=600,
+					employees=employees, leave_period=self, carry_forward_leaves=carry_forward_leaves)
+			else:
+				grant_leave_alloc_for_employees(employees, self, carry_forward_leaves)
+		else:
+			frappe.msgprint(_("No Employee Found"))
+
+def grant_leave_alloc_for_employees(employees, leave_period, carry_forward_leaves=0):
+	leave_allocations = []
+	existing_allocations_for = get_existing_allocations(employees, leave_period.name)
+	leave_type_details = get_leave_type_details()
+	count=0
+	for employee in employees:
+		if employee in existing_allocations_for:
+			continue
+		count +=1
+		leave_policy = get_employee_leave_policy(employee)
+		if leave_policy:
+			for leave_policy_detail in leave_policy.leave_policy_details:
+				if not leave_type_details.get(leave_policy_detail.leave_type).is_lwp:
+					leave_allocation = create_leave_allocation(employee, leave_policy_detail.leave_type,
+						leave_policy_detail.annual_allocation, leave_type_details, leave_period, carry_forward_leaves)
+					leave_allocations.append(leave_allocation)
+		frappe.db.commit()
+		frappe.publish_progress(count*100/len(set(employees) - set(existing_allocations_for)), title = _("Allocating leaves..."))
+
+	if leave_allocations:
+		frappe.msgprint(_("Leaves has been granted sucessfully"))
+
+def get_existing_allocations(employees, leave_period):
+	leave_allocations = frappe.db.sql_list("""
+		select distinct employee from `tabLeave Allocation` 
+		where leave_period=%s and employee in (%s) and docstatus=1
+	""" % ('%s', ', '.join(['%s']*len(employees))), [leave_period] + employees)
+	if leave_allocations:
+		frappe.msgprint(_("Skipping Leave Allocation for the following employees, as Leave Allocation records already exists against them. {0}")
+			.format("\n".join(leave_allocations)))
+	return leave_allocations
+
+def get_leave_type_details():
+	leave_type_details = frappe._dict()
+	leave_types = frappe.get_all("Leave Type", fields=["name", "is_lwp", "is_earned_leave", "is_compensatory", "is_carry_forward"])
+	for d in leave_types:
+		leave_type_details.setdefault(d.name, d)
+	return leave_type_details
+
+def create_leave_allocation(employee, leave_type, new_leaves_allocated, leave_type_details, leave_period, carry_forward_leaves):
+	allocation = frappe.new_doc("Leave Allocation")
+	allocation.employee = employee
+	allocation.leave_type = leave_type
+	allocation.from_date = leave_period.from_date
+	allocation.to_date = leave_period.to_date
+	# Earned Leaves and Compensatory Leaves are allocated by scheduler, initially allocate 0
+	if leave_type_details.get(leave_type).is_earned_leave == 1 or leave_type_details.get(leave_type).is_compensatory == 1:
+		new_leaves_allocated = 0
+
+	allocation.new_leaves_allocated = new_leaves_allocated
+	allocation.leave_period = leave_period.name
+	if carry_forward_leaves:
+		if leave_type_details.get(leave_type).is_carry_forward:
+			allocation.carry_forward = carry_forward_leaves
+	allocation.save(ignore_permissions = True)
+	allocation.submit()
+	return allocation.name
 
 
-	def print_message(self, leave_allocations):
-		if leave_allocations:
-			frappe.msgprint(_("Leave Allocations {0} created").format(", "
-				.join(map(lambda x: """ <b><a href="#Form/Leave Allocation/{0}">{0}</a></b>""".format(x), leave_allocations))))
diff --git a/erpnext/hr/doctype/leave_period/leave_period_dashboard.py b/erpnext/hr/doctype/leave_period/leave_period_dashboard.py
new file mode 100644
index 0000000..5214a58
--- /dev/null
+++ b/erpnext/hr/doctype/leave_period/leave_period_dashboard.py
@@ -0,0 +1,12 @@
+from frappe import _
+
+def get_data():
+	return {
+		'fieldname': 'leave_period',
+		'transactions': [
+			{
+				'label': _('Transactions'),
+				'items': ['Leave Allocation']
+			}
+		]
+	}
\ No newline at end of file
diff --git a/erpnext/hr/utils.py b/erpnext/hr/utils.py
index acb94fe..f7de816 100644
--- a/erpnext/hr/utils.py
+++ b/erpnext/hr/utils.py
@@ -209,10 +209,10 @@
 			leave_policy = frappe.db.get_value("Employee Grade", employee_grade, "default_leave_policy")
 			if not leave_policy:
 				frappe.throw(_("Employee {0} of grade {1} have no default leave policy").format(employee, employee_grade))
-		else:
-			frappe.throw(_("Employee {0} has no grade to get default leave policy").format(employee))
 	if leave_policy:
 		return frappe.get_doc("Leave Policy", leave_policy)
+	else:
+		frappe.throw(_("Please set leave policy for employee {0} in Employee / Grade record").format(employee))
 
 def validate_tax_declaration(declarations):
 	subcategories = []
diff --git a/erpnext/patches/v8_7/add_more_gst_fields.py b/erpnext/patches/v8_7/add_more_gst_fields.py
index fc76a06..d2085e0 100644
--- a/erpnext/patches/v8_7/add_more_gst_fields.py
+++ b/erpnext/patches/v8_7/add_more_gst_fields.py
@@ -6,6 +6,6 @@
 	if not company:
 		return
 
-	frappe.reload_doc('hr', 'doctype', 'Employee Tax Exemption Declaration')
-	frappe.reload_doc('hr', 'doctype', 'Employee Tax Exemption Proof Submission')
+	frappe.reload_doc('hr', 'doctype', 'employee_tax_exemption_declaration')
+	frappe.reload_doc('hr', 'doctype', 'employee_tax_exemption_proof_submission')
 	make_custom_fields()
\ No newline at end of file