[patch] Set default material request type in Item based on default bom

erpnext/patches.txt

@@ -307,4 +307,4 @@ erpnext.patches.v7_0.fix_nonwarehouse_ledger_gl_entries_for_transactions
 erpnext.patches.v7_0.remove_old_earning_deduction_doctypes
 erpnext.patches.v7_0.make_guardian
 erpnext.patches.v7_0.update_refdoc_in_landed_cost_voucher
-execute:frappe.db.sql("update `tabItem` set default_material_request_type= case when default_bom is not null then 'Manufacture' else 'Purchase' end")
+erpnext.patches.v7_0.set_material_request_type_in_item

erpnext/patches/v7_0/set_material_request_type_in_item.py

@@ -0,0 +1,16 @@
+from __future__ import unicode_literals
+import frappe
+
+def execute():
+	frappe.reload_doctype("Item")
+	if "default_bom" in frappe.db.get_table_columns("Item"):
+		frappe.db.sql("""update `tabItem` 
+			set default_material_request_type = (
+				case 
+					when (default_bom is not null and default_bom != '')
+					then 'Manufacture' 
+					else 'Purchase' 
+				end )""")
+				
+	else:
+		frappe.db.sql("update tabItem set default_material_request_type='Purchase'")