diff --git a/erpnext/hr/doctype/leave_allocation/leave_allocation.py b/erpnext/hr/doctype/leave_allocation/leave_allocation.py
index 331a82bd8a..86ed18718e 100755
--- a/erpnext/hr/doctype/leave_allocation/leave_allocation.py
+++ b/erpnext/hr/doctype/leave_allocation/leave_allocation.py
@@ -87,7 +87,10 @@ class LeaveAllocation(Document):
 			self.from_date, self.to_date)
 		
 		if flt(leaves_taken) > flt(self.total_leaves_allocated):
-			frappe.throw(_("Total allocated leaves {0} cannot be less than already approved leaves {1} for the period").format(self.total_leaves_allocated, leaves_taken), LessAllocationError)
+			if frappe.db.get_value("Leave Type", self.leave_type, "allow_negative"):
+				frappe.msgprint(_("Note: Total allocated leaves {0} shouldn't be less than already approved leaves {1} for the period").format(self.total_leaves_allocated, leaves_taken), LessAllocationError)
+			else:
+				frappe.throw(_("Total allocated leaves {0} cannot be less than already approved leaves {1} for the period").format(self.total_leaves_allocated, leaves_taken), LessAllocationError)
 
 @frappe.whitelist()
 def get_carry_forwarded_leaves(employee, leave_type, date, carry_forward=None):
@@ -113,4 +116,4 @@ def get_carry_forwarded_leaves(employee, leave_type, date, carry_forward=None):
 def validate_carry_forward(leave_type):
 	if not frappe.db.get_value("Leave Type", leave_type, "is_carry_forward"):
 		frappe.throw(_("Leave Type {0} cannot be carry-forwarded").format(leave_type))
-	
\ No newline at end of file
+