diff --git a/erpnext/patches.txt b/erpnext/patches.txt
index f7e7849..85f5bda 100644
--- a/erpnext/patches.txt
+++ b/erpnext/patches.txt
@@ -111,3 +111,4 @@
 erpnext.patches.v5_0.new_crm_module
 erpnext.patches.v5_0.rename_customer_issue
 erpnext.patches.v5_0.update_material_transfer_for_manufacture
+erpnext.patches.v5_0.manufacturing_activity_type
diff --git a/erpnext/patches/v5_0/manufacturing_activity_type.py b/erpnext/patches/v5_0/manufacturing_activity_type.py
new file mode 100644
index 0000000..d4e7873
--- /dev/null
+++ b/erpnext/patches/v5_0/manufacturing_activity_type.py
@@ -0,0 +1,13 @@
+# Copyright (c) 2013, Web Notes Technologies Pvt. Ltd. and Contributors
+# License: GNU General Public License v3. See license.txt
+
+import frappe
+
+def execute():
+	if not frappe.db.exists('Activity Type','Manufacturing') {
+		doc = frappe.new_doc('Activity Type')
+		doc.update({
+			'activity_type' : 'Manufacturing'
+		})
+		doc.save()
+	}
\ No newline at end of file
diff --git a/erpnext/projects/doctype/activity_type/activity_type.py b/erpnext/projects/doctype/activity_type/activity_type.py
index a98d8cf..7e316b5 100644
--- a/erpnext/projects/doctype/activity_type/activity_type.py
+++ b/erpnext/projects/doctype/activity_type/activity_type.py
@@ -7,4 +7,10 @@
 from frappe.model.document import Document
 
 class ActivityType(Document):
-	pass
\ No newline at end of file
+	
+	def on_trash(self):
+		self.validate_manufacturing_type()
+		
+	def validate_manufacturing_type(self):
+		if self.activity_type == 'Manufacturing':
+			frappe.throw(_("Activity Type 'Manufacturing' cannot be deleted."))
\ No newline at end of file
diff --git a/erpnext/setup/page/setup_wizard/install_fixtures.py b/erpnext/setup/page/setup_wizard/install_fixtures.py
index 96ea0d9..b24eaa6 100644
--- a/erpnext/setup/page/setup_wizard/install_fixtures.py
+++ b/erpnext/setup/page/setup_wizard/install_fixtures.py
@@ -135,7 +135,7 @@
 		{'doctype': 'Activity Type', 'activity_type': _('Proposal Writing')},
 		{'doctype': 'Activity Type', 'activity_type': _('Execution')},
 		{'doctype': 'Activity Type', 'activity_type': _('Communication')},
-		{'doctype': 'Activity Type', 'activity_type': _('Manufacturing')},
+		{'doctype': 'Activity Type', 'activity_type': 'Manufacturing'},
 
 		# Industry Type
 		{'doctype': 'Industry Type', 'industry': _('Accounting')},