fix: make Exit Interview submittable
diff --git a/erpnext/hr/doctype/exit_interview/exit_interview.json b/erpnext/hr/doctype/exit_interview/exit_interview.json
index bed0e77..d4d4aac 100644
--- a/erpnext/hr/doctype/exit_interview/exit_interview.json
+++ b/erpnext/hr/doctype/exit_interview/exit_interview.json
@@ -32,7 +32,8 @@
   "interviewers",
   "text_editor_12",
   "employee_status_section",
-  "employee_status"
+  "employee_status",
+  "amended_from"
  ],
  "fields": [
   {
@@ -188,7 +189,7 @@
    "in_list_view": 1,
    "in_standard_filter": 1,
    "label": "Status",
-   "options": "Pending\nScheduled\nCompleted",
+   "options": "Pending\nScheduled\nCompleted\nCancelled",
    "reqd": 1
   },
   {
@@ -203,11 +204,21 @@
    "label": "Final Decision",
    "mandatory_depends_on": "eval:doc.status==='Completed';",
    "options": "\nEmployee Retained\nExit Confirmed"
+  },
+  {
+   "fieldname": "amended_from",
+   "fieldtype": "Link",
+   "label": "Amended From",
+   "no_copy": 1,
+   "options": "Exit Interview",
+   "print_hide": 1,
+   "read_only": 1
   }
  ],
  "index_web_pages_for_search": 1,
+ "is_submittable": 1,
  "links": [],
- "modified": "2021-12-05 17:17:20.033950",
+ "modified": "2021-12-05 17:49:44.839277",
  "modified_by": "Administrator",
  "module": "HR",
  "name": "Exit Interview",
diff --git a/erpnext/hr/doctype/exit_interview/exit_interview.py b/erpnext/hr/doctype/exit_interview/exit_interview.py
index a59146a..878380b 100644
--- a/erpnext/hr/doctype/exit_interview/exit_interview.py
+++ b/erpnext/hr/doctype/exit_interview/exit_interview.py
@@ -12,6 +12,7 @@
 class ExitInterview(Document):
 	def validate(self):
 		self.validate_relieving_date()
+		self.validate_duplicate_interview()
 		self.set_employee_email()
 
 	def validate_relieving_date(self):
@@ -20,10 +21,21 @@
 				get_link_to_form('Employee', self.employee)),
 				title=_('Relieving Date Missing'))
 
+	def validate_duplicate_interview(self):
+		doc = frappe.db.exists('Exit Interview', {'employee': self.employee, 'name': ('!=', self.name)})
+		if doc:
+			frappe.throw(_('Exit Interview {0} already scheduled for Employee: {1}').format(
+				get_link_to_form('Exit Interview', doc), frappe.bold(self.employee)),
+				title=_('Duplicate Document'))
+
 	def set_employee_email(self):
 		employee = frappe.get_doc('Employee', self.employee)
 		self.email = get_employee_email(employee)
 
+	def on_submit(self):
+		if self.status != 'Completed':
+			frappe.throw(_('Only Completed documents can be submitted'))
+
 
 @frappe.whitelist()
 def send_exit_questionnaire(exit_interview):