diff --git a/erpnext/selling/doctype/sales_order/sales_order.py b/erpnext/selling/doctype/sales_order/sales_order.py
index 04d85e5..accf59e 100755
--- a/erpnext/selling/doctype/sales_order/sales_order.py
+++ b/erpnext/selling/doctype/sales_order/sales_order.py
@@ -418,8 +418,7 @@
 	def on_recurring(self, reference_doc, auto_repeat_doc):
 
 		def _get_delivery_date(ref_doc_delivery_date, red_doc_transaction_date, transaction_date):
-			delivery_date = get_next_schedule_date(ref_doc_delivery_date,
-				auto_repeat_doc.frequency, auto_repeat_doc.start_date, cint(auto_repeat_doc.repeat_on_day))
+			delivery_date = auto_repeat_doc.get_next_schedule_date(schedule_date=ref_doc_delivery_date)
 
 			if delivery_date <= transaction_date:
 				delivery_date_diff = frappe.utils.date_diff(ref_doc_delivery_date, red_doc_transaction_date)