diff --git a/erpnext/support/doctype/issue/issue.py b/erpnext/support/doctype/issue/issue.py
index e092b07..dd6d647 100644
--- a/erpnext/support/doctype/issue/issue.py
+++ b/erpnext/support/doctype/issue/issue.py
@@ -26,9 +26,6 @@
 
 		self.set_lead_contact(self.raised_by)
 
-		if not self.service_level_agreement:
-			self.reset_sla_fields()
-
 	def on_update(self):
 		# Add a communication in the issue timeline
 		if self.flags.create_communication and self.via_customer_portal:
@@ -54,106 +51,6 @@
 				self.company = frappe.db.get_value("Lead", self.lead, "company") or \
 					frappe.db.get_default("Company")
 
-	def reset_sla_fields(self):
-		self.agreement_status = ""
-		self.response_by = ""
-		self.resolution_by = ""
-		self.response_by_variance = 0
-		self.resolution_by_variance = 0
-
-	def update_status(self):
-		status = frappe.db.get_value("Issue", self.name, "status")
-		if self.status != "Open" and status == "Open" and not self.first_responded_on:
-			self.first_responded_on = frappe.flags.current_time or now_datetime()
-
-		if self.status in ["Closed", "Resolved"] and status not in ["Resolved", "Closed"]:
-			self.resolution_date = frappe.flags.current_time or now_datetime()
-			if frappe.db.get_value("Issue", self.name, "agreement_status") == "Ongoing":
-				set_service_level_agreement_variance(issue=self.name)
-				self.update_agreement_status()
-			set_resolution_time(issue=self)
-			set_user_resolution_time(issue=self)
-
-		if self.status == "Open" and status != "Open":
-			# if no date, it should be set as None and not a blank string "", as per mysql strict config
-			self.resolution_date = None
-			self.reset_issue_metrics()
-			# enable SLA and variance on Reopen
-			self.agreement_status = "Ongoing"
-			set_service_level_agreement_variance(issue=self.name)
-
-		self.handle_hold_time(status)
-
-	def handle_hold_time(self, status):
-		if self.service_level_agreement:
-			# set response and resolution variance as None as the issue is on Hold
-			pause_sla_on = frappe.db.get_all("Pause SLA On Status", fields=["status"],
-				filters={"parent": self.service_level_agreement})
-			hold_statuses = [entry.status for entry in pause_sla_on]
-			update_values = {}
-
-			if hold_statuses:
-				if self.status in hold_statuses and status not in hold_statuses:
-					update_values['on_hold_since'] = frappe.flags.current_time or now_datetime()
-					if not self.first_responded_on:
-						update_values['response_by'] = None
-						update_values['response_by_variance'] = 0
-					update_values['resolution_by'] = None
-					update_values['resolution_by_variance'] = 0
-
-				# calculate hold time when status is changed from any hold status to any non-hold status
-				if self.status not in hold_statuses and status in hold_statuses:
-					hold_time = self.total_hold_time if self.total_hold_time else 0
-					now_time = frappe.flags.current_time or now_datetime()
-					last_hold_time = 0
-					if self.on_hold_since:
-						# last_hold_time will be added to the sla variables
-						last_hold_time = time_diff_in_seconds(now_time, self.on_hold_since)
-						update_values['total_hold_time'] = hold_time + last_hold_time
-
-					# re-calculate SLA variables after issue changes from any hold status to any non-hold status
-					# add hold time to SLA variables
-					start_date_time = get_datetime(self.service_level_agreement_creation)
-					priority = get_priority(self)
-					now_time = frappe.flags.current_time or now_datetime()
-
-					if not self.first_responded_on:
-						response_by = get_expected_time_for(parameter="response", service_level=priority, start_date_time=start_date_time)
-						response_by = add_to_date(response_by, seconds=round(last_hold_time))
-						response_by_variance = round(time_diff_in_seconds(response_by, now_time))
-						update_values['response_by'] = response_by
-						update_values['response_by_variance'] = response_by_variance + last_hold_time
-
-					resolution_by = get_expected_time_for(parameter="resolution", service_level=priority, start_date_time=start_date_time)
-					resolution_by = add_to_date(resolution_by, seconds=round(last_hold_time))
-					resolution_by_variance = round(time_diff_in_seconds(resolution_by, now_time))
-					update_values['resolution_by'] = resolution_by
-					update_values['resolution_by_variance'] = resolution_by_variance + last_hold_time
-					update_values['on_hold_since'] = None
-
-				self.db_set(update_values)
-
-	def update_agreement_status(self):
-		if self.service_level_agreement and self.agreement_status == "Ongoing":
-			if cint(frappe.db.get_value("Issue", self.name, "response_by_variance")) < 0 or \
-				cint(frappe.db.get_value("Issue", self.name, "resolution_by_variance")) < 0:
-
-				self.agreement_status = "Failed"
-			else:
-				self.agreement_status = "Fulfilled"
-
-	def update_agreement_status_on_custom_status(self):
-		"""
-			Update Agreement Fulfilled status using Custom Scripts for Custom Issue Status
-		"""
-		if not self.first_responded_on: # first_responded_on set when first reply is sent to customer
-			self.response_by_variance = round(time_diff_in_seconds(self.response_by, now_datetime()), 2)
-
-		if not self.resolution_date: # resolution_date set when issue has been closed
-			self.resolution_by_variance = round(time_diff_in_seconds(self.resolution_by, now_datetime()), 2)
-
-		self.agreement_status = "Fulfilled" if self.response_by_variance > 0 and self.resolution_by_variance > 0 else "Failed"
-
 	def create_communication(self):
 		communication = frappe.new_doc("Communication")
 		communication.update({
@@ -318,4 +215,4 @@
 def get_holidays(holiday_list_name):
 	holiday_list = frappe.get_cached_doc("Holiday List", holiday_list_name)
 	holidays = [holiday.holiday_date for holiday in holiday_list.holidays]
-	return holidays
+	return holidays
\ No newline at end of file