diff --git a/erpnext/regional/india/setup.py b/erpnext/regional/india/setup.py
index 5f9d5ed..5ef04b6 100644
--- a/erpnext/regional/india/setup.py
+++ b/erpnext/regional/india/setup.py
@@ -122,10 +122,12 @@
 def make_property_setters(patch=False):
 	# GST rules do not allow for an invoice no. bigger than 16 characters
 	journal_entry_types = frappe.get_meta("Journal Entry").get_options("voucher_type").split("\n") + ['Reversal Of ITC']
+	sales_invoice_series = frappe.get_meta("Sales Invoice").get_options("naming_series").split("\n") + ['SINV-.YY.-', 'SRET-.YY.-', '']
+	purchase_invoice_series = frappe.get_meta("Purchase Invoice").get_options("naming_series").split("\n") + ['PINV-.YY.-', 'PRET-.YY.-', '']
 
 	if not patch:
-		make_property_setter('Sales Invoice', 'naming_series', 'options', 'SINV-.YY.-\nSRET-.YY.-', '')
-		make_property_setter('Purchase Invoice', 'naming_series', 'options', 'PINV-.YY.-\nPRET-.YY.-', '')
+		make_property_setter('Sales Invoice', 'naming_series', 'options', '\n'.join(sales_invoice_series), '')
+		make_property_setter('Purchase Invoice', 'naming_series', 'options', '\n'.join(purchase_invoice_series), '')
 		make_property_setter('Journal Entry', 'voucher_type', 'options', '\n'.join(journal_entry_types), '')
 
 def make_custom_fields(update=True):