diff --git a/erpnext/controllers/subcontracting_controller.py b/erpnext/controllers/subcontracting_controller.py
index 51840d49989..84a65160135 100644
--- a/erpnext/controllers/subcontracting_controller.py
+++ b/erpnext/controllers/subcontracting_controller.py
@@ -103,6 +103,16 @@ class SubcontractingController(StockController):
 						_("Row {0}: Item {1} must be a subcontracted item.").format(item.idx, item.item_name)
 					)
 
+				if (
+					self.doctype == "Subcontracting Order" and not item.sc_conversion_factor
+				):  # this condition will only be true if user has recently updated from develop branch
+					service_item_qty = frappe.get_value(
+						"Subcontracting Order Service Item",
+						filters={"purchase_order_item": item.purchase_order_item, "parent": self.name},
+						fieldname=["qty"],
+					)
+					item.sc_conversion_factor = service_item_qty / item.qty
+
 				if (
 					self.doctype not in "Subcontracting Receipt"
 					and item.qty
diff --git a/erpnext/patches.txt b/erpnext/patches.txt
index 9b4dd738d84..5fe116657fa 100644
--- a/erpnext/patches.txt
+++ b/erpnext/patches.txt
@@ -393,4 +393,4 @@ erpnext.patches.v15_0.set_is_exchange_gain_loss_in_payment_entry_deductions
 erpnext.patches.v14_0.update_stock_uom_in_work_order_item
 erpnext.patches.v15_0.enable_allow_existing_serial_no
 erpnext.patches.v15_0.update_cc_in_process_statement_of_accounts
-erpnext.patches.v15_0.refactor_closing_stock_balance #5
+erpnext.patches.v15_0.refactor_closing_stock_balance #5
\ No newline at end of file