diff --git a/erpnext/patches/v12_0/move_parameters_to_priority.py b/erpnext/patches/v12_0/move_parameters_to_priority.py
index c62c1c3..310bfe2 100644
--- a/erpnext/patches/v12_0/move_parameters_to_priority.py
+++ b/erpnext/patches/v12_0/move_parameters_to_priority.py
@@ -5,62 +5,34 @@
 import frappe
 
 def execute():
-	priorities = ["Low", "Medium", "High"]
+	priority = ["Low", "Medium", "High"]
 
 	service_levels = frappe.get_list("Service Level")
 	for service_level in service_levels:
 		doc = frappe.get_doc("Service Level", service_level)
-		doc.update({
-			"priorities": [
+		for value in priority:
+			doc.append("priorities",
 				{
-					"priority": "Low",
-					"response_time": doc.response_time,
-					"response_time_period": doc.response_time_period,
-					"resolution_time": doc.resolution_time,
-					"resolution_time_period": doc.resolution_time_period,
-				},
-				{
-					"priority": "Medium",
-					"response_time": doc.response_time,
-					"response_time_period": doc.response_time_period,
-					"resolution_time": doc.resolution_time,
-					"resolution_time_period": doc.resolution_time_period,
-				},
-				{
-					"priority": "High",
+					"priority": "{0}".format(value),
 					"response_time": doc.response_time,
 					"response_time_period": doc.response_time_period,
 					"resolution_time": doc.resolution_time,
 					"resolution_time_period": doc.resolution_time_period,
 				}
-			]
-		})
+			)
+		doc.save(ignore_permissions=True)
 
 	service_level_agreements = frappe.get_list("Service Level Agreement")
 	for service_level_agreement in service_level_agreements:
 		doc = frappe.get_doc("Service Level Agreement", service_level_agreement)
-		doc.update({
-			"priorities": [
+		for value in priority:
+			doc.append("priorities",
 				{
-					"priority": "Low",
+					"priority": "{0}".format(value),
 					"response_time": doc.response_time,
 					"response_time_period": doc.response_time_period,
 					"resolution_time": doc.resolution_time,
 					"resolution_time_period": doc.resolution_time_period,
-				},
-				{
-					"priority": "Medium",
-					"response_time": doc.response_time,
-					"response_time_period": doc.response_time_period,
-					"resolution_time": doc.resolution_time,
-					"resolution_time_period": doc.resolution_time_period,
-				},
-				{
-					"priority": "High",
-					"response_time": doc.response_time,
-					"response_time_period": doc.response_time_period,
-					"resolution_time": doc.resolution_time,
-					"resolution_time_period": doc.resolution_time_period,
-				},
-			]
-		})
+				}
+			)
+		doc.save(ignore_permissions=True)
\ No newline at end of file
diff --git a/erpnext/support/doctype/issue/issue.js b/erpnext/support/doctype/issue/issue.js
index a19b372..ab40a5b 100644
--- a/erpnext/support/doctype/issue/issue.js
+++ b/erpnext/support/doctype/issue/issue.js
@@ -4,7 +4,7 @@
 	},
 
 	refresh: function (frm) {
-		if (frm.doc.service_level_agreement) {
+		if (frm.doc.service_level_agreement && frm.doc.status !== "Closed") {
 			set_time_to_resolve_and_response(frm);
 		}
 
diff --git a/erpnext/support/doctype/issue/issue.py b/erpnext/support/doctype/issue/issue.py
index 66eb55a..7eeb783 100644
--- a/erpnext/support/doctype/issue/issue.py
+++ b/erpnext/support/doctype/issue/issue.py
@@ -128,8 +128,8 @@
 	def before_insert(self):
 		self.set_response_and_resolution_time(priority=self.priority)
 
-	def set_response_and_resolution_time(self, priority=None):
-		service_level_agreement = get_active_service_level_agreement_for(self.customer, priority)
+	def set_response_and_resolution_time(self, priority):
+		service_level_agreement = get_active_service_level_agreement_for(priority=priority, customer=self.customer)
 		if service_level_agreement:
 			self.service_level_agreement = service_level_agreement.name
 		else:
diff --git a/erpnext/support/doctype/service_level_agreement/service_level_agreement.json b/erpnext/support/doctype/service_level_agreement/service_level_agreement.json
index 84dbdde..b63e2af 100644
--- a/erpnext/support/doctype/service_level_agreement/service_level_agreement.json
+++ b/erpnext/support/doctype/service_level_agreement/service_level_agreement.json
@@ -70,7 +70,6 @@
    "read_only": 1
   },
   {
-   "depends_on": "eval: !doc.default_service_level_agreement",
    "fieldname": "agreement_details_section",
    "fieldtype": "Section Break",
    "label": "Agreement Details"
@@ -83,7 +82,6 @@
   },
   {
    "default": "Active",
-   "depends_on": "eval: !doc.default_service_level_agreement",
    "fieldname": "agreement_status",
    "fieldtype": "Select",
    "label": "Agreement Status",
@@ -133,7 +131,7 @@
    "unique": 1
   }
  ],
- "modified": "2019-05-06 00:31:06.167762",
+ "modified": "2019-05-06 22:00:44.623128",
  "modified_by": "Administrator",
  "module": "Support",
  "name": "Service Level Agreement",
diff --git a/erpnext/support/doctype/service_level_agreement/service_level_agreement.py b/erpnext/support/doctype/service_level_agreement/service_level_agreement.py
index ea869ee..00f5cb3 100644
--- a/erpnext/support/doctype/service_level_agreement/service_level_agreement.py
+++ b/erpnext/support/doctype/service_level_agreement/service_level_agreement.py
@@ -14,7 +14,7 @@
 			frappe.throw(_("Select a Customer or set as Default Service Level Agreement."))
 
 		if self.default_service_level_agreement:
-			if frappe.db.exists("Service Level Agreement", {"default_service_level_agreement": "1"}):
+			if frappe.db.exists("Service Level Agreement", {"default_service_level_agreement": "1", "name": ["!=", self.name]}):
 				frappe.throw(_("A Default Service Level Agreement already exists."))
 		else:
 			if not (self.start_date and self.end_date):
@@ -31,33 +31,23 @@
 		{"agreement_status": "Active"},
 		{"default_service_level_agreement": 0}
 	])
-	service_level_agreements.reverse()
+
 	for service_level_agreement in service_level_agreements:
 		service_level_agreement = frappe.get_doc("Service Level Agreement", service_level_agreement)
+
 		if service_level_agreement.end_date < frappe.utils.getdate():
-			service_level_agreement.agreement_status = "Expired"
-		service_level_agreement.save()
+			frappe.db.set_value("Service Level Agreement", service_level_agreement.name,
+				"agreement_status", "Expired")
 
 @frappe.whitelist()
-def get_active_service_level_agreement_for(customer, priority):
+def get_active_service_level_agreement_for(priority, customer=None):
 
-	agreement = frappe.db.sql("""select `tabService Level Agreement`.name, `tabService Level Agreement`.service_level,
-		`tabService Level Agreement`.holiday_list
-		from `tabService Level Agreement`
-		inner join `tabService Level Priority`
-		on `tabService Level Agreement`.name=`tabService Level Priority`.parent where
-		(
-			`tabService Level Agreement`.customer='%(customer)s' and
-			`tabService Level Agreement`.agreement_status='Active' and
-			`tabService Level Priority`.priority='%(priority)s'
-		) or
-		(
-			`tabService Level Agreement`.default_service_level_agreement='1'
-		)
-		 limit 1""",
-		{
-			"customer": customer,
-			"priority": priority
-		}, as_dict=True)
+	if customer and frappe.db.exists("Service Level Agreement", {"customer": customer}):
+		or_filter = {"customer": customer}
+	else:
+		or_filter = {"default_service_level_agreement": 1}
+
+	agreement = frappe.get_list("Service Level Agreement", filters={"agreement_status": "Active"},
+		or_filters=or_filter, fields=["name", "service_level"])
 
 	return agreement[0] if agreement else None
\ No newline at end of file
diff --git a/erpnext/support/doctype/service_level_agreement/test_service_level_agreement.py b/erpnext/support/doctype/service_level_agreement/test_service_level_agreement.py
index b9d25e4..b2c0eba 100644
--- a/erpnext/support/doctype/service_level_agreement/test_service_level_agreement.py
+++ b/erpnext/support/doctype/service_level_agreement/test_service_level_agreement.py
@@ -85,7 +85,7 @@
 		]
 	})
 
-	default_service_level_agreement_exists = frappe.db.exists("Service Level Agreement", "Default Service Level Agreement")
+	default_service_level_agreement_exists = frappe.db.exists("Service Level Agreement", "SLA-Default Service Level Agreement")
 	if not default_service_level_agreement_exists:
 		default_service_level_agreement.insert(ignore_permissions=True)
 
@@ -172,7 +172,7 @@
 		]
 	})
 
-	service_level_agreement_exists = frappe.db.exists("Service Level Agreement", "_Test Service Level Agreement")
+	service_level_agreement_exists = frappe.db.exists("Service Level Agreement", "SLA-_Test Service Level Agreement")
 	if not service_level_agreement_exists:
 		service_level_agreement.insert(ignore_permissions=True)
 		return service_level_agreement.name
@@ -180,5 +180,5 @@
 		return service_level_agreement_exists
 
 def get_service_level_agreement():
-	service_level_agreement = frappe.db.exists("Service Level Agreement", "_Test Service Level Agreement")
+	service_level_agreement = frappe.db.exists("Service Level Agreement", "SLA-_Test Service Level Agreement")
 	return service_level_agreement
\ No newline at end of file