diff --git a/erpnext/hr/doctype/salary_structure_assignment/salary_structure_assignment.py b/erpnext/hr/doctype/salary_structure_assignment/salary_structure_assignment.py
index 26e7fce..6721749 100644
--- a/erpnext/hr/doctype/salary_structure_assignment/salary_structure_assignment.py
+++ b/erpnext/hr/doctype/salary_structure_assignment/salary_structure_assignment.py
@@ -21,7 +21,9 @@
 			if joining_date and getdate(self.from_date) < joining_date:
 				frappe.throw(_("From Date {0} cannot be before employee's joining Date {1}")
 					.format(self.from_date, joining_date))
-			if relieving_date and getdate(self.from_date) > relieving_date:
+
+			# flag - old_employee is for migrating the old employees data via patch
+			if relieving_date and getdate(self.from_date) > relieving_date and not self.flags.old_employee:
 				frappe.throw(_("From Date {0} cannot be after employee's relieving Date {1}")
 					.format(self.from_date, relieving_date))
 
@@ -29,7 +31,7 @@
 			if self.from_date and getdate(self.from_date) > getdate(self.to_date):
 				frappe.throw(_("From Date {0} cannot be after To Date {1}")
 					.format(self.from_date, self.to_date))
-			if relieving_date and getdate(self.to_date) > relieving_date:
+			if relieving_date and getdate(self.to_date) > relieving_date and not self.flags.old_employee:
 				frappe.throw(_("To Date {0} cannot be after employee's relieving Date {1}")
 					.format(self.to_date, relieving_date))
 
diff --git a/erpnext/patches/v11_0/create_salary_structure_assignments.py b/erpnext/patches/v11_0/create_salary_structure_assignments.py
index 289554e..24874f6 100644
--- a/erpnext/patches/v11_0/create_salary_structure_assignments.py
+++ b/erpnext/patches/v11_0/create_salary_structure_assignments.py
@@ -18,6 +18,9 @@
 		s.base = d.base
 		s.variable = d.variable
 		s.company = d.company
+
+		# to migrate the data of the old employees
+		s.flags.old_employee = True
 		s.save()
 
 	frappe.db.sql("update `tabSalary Structure` set docstatus=1")
\ No newline at end of file