diff --git a/erpnext/hr/doctype/compensatory_leave_request/compensatory_leave_request.py b/erpnext/hr/doctype/compensatory_leave_request/compensatory_leave_request.py
index ec52228..4140668 100644
--- a/erpnext/hr/doctype/compensatory_leave_request/compensatory_leave_request.py
+++ b/erpnext/hr/doctype/compensatory_leave_request/compensatory_leave_request.py
@@ -5,7 +5,7 @@
 from __future__ import unicode_literals
 import frappe
 from frappe import _
-from frappe.utils import date_diff
+from frappe.utils import date_diff, add_days
 from frappe.model.document import Document
 from erpnext.hr.utils import validate_dates, validate_overlap, get_leave_period
 
@@ -20,21 +20,49 @@
 			frappe.throw(_("Please select a leave type to submit the request"))
 		else:
 			company = frappe.db.get_value("Employee", self.employee, "company")
+			date_difference = date_diff(self.work_end_date, self.work_from_date) + 1
 			leave_period = get_leave_period(self.work_from_date, self.work_end_date, company)
 			if leave_period:
-				self.create_leave_allocation(leave_period)
+				leave_allocation_name = self.exists_allocation_for_period(leave_period)
+				if leave_allocation_name:
+					leave_allocation = frappe.get_doc("Leave Allocation", leave_allocation_name)
+					new_leaves_allocated = leave_allocation.new_leaves_allocated
+					leave_allocation.new_leaves_allocated += date_difference
+					leave_allocation.submit()
+				else:
+					self.create_leave_allocation(leave_period, date_difference)
 			else:
 				frappe.throw(_("There is no leave period in between {0} and {1}").format(self.work_from_date, self.work_end_date))
 
-	def create_leave_allocation(self, leave_period):
-		date_difference = date_diff(self.work_end_date, self.work_from_date) + 1
+	def exists_allocation_for_period(self, leave_period):
+		leave_allocation = frappe.db.sql("""
+			select name
+			from `tabLeave Allocation`
+			where employee=%(employee)s and leave_type=%(leave_type)s
+				and docstatus=1
+				and (from_date between %(from_date)s and %(to_date)s
+					or to_date between %(from_date)s and %(to_date)s
+					or (from_date < %(from_date)s and to_date > %(to_date)s))
+		""", {
+			"from_date": leave_period[0].from_date,
+			"to_date": leave_period[0].to_date,
+			"employee": self.employee,
+			"leave_type": self.leave_type
+		}, as_dict=1)
+
+		if leave_allocation:
+			return leave_allocation[0].name
+		else:
+			False
+
+	def create_leave_allocation(self, leave_period, date_difference):
 		is_carry_forward = frappe.db.get_value("Leave Type", self.leave_type, "is_carry_forward")
 		allocation = frappe.new_doc("Leave Allocation")
 		allocation.employee = self.employee
 		allocation.employee_name = self.employee_name
 		allocation.leave_type = self.leave_type
-		allocation.from_date = self.work_from_date
-		allocation.to_date = self.work_end_date
+		allocation.from_date = add_days(self.work_end_date, 1)
+		allocation.to_date = leave_period[0].to_date
 		allocation.new_leaves_allocated = date_difference
 		allocation.total_leaves_allocated = date_difference
 		allocation.compensatory_request = self.name