fix: zero incoming rate for delivery note return (#43642)

(cherry picked from commit 6087a57b0c)

# Conflicts:
#	erpnext/stock/doctype/delivery_note/test_delivery_note.py

erpnext/controllers/selling_controller.py

@@ -456,6 +456,16 @@ class SellingController(StockController):
 						raise_error_if_no_rate=False,
 					)
 
+				if (
+					not d.incoming_rate
+					and self.get("return_against")
+					and self.get("is_return")
+					and get_valuation_method(d.item_code) == "Moving Average"
+				):
+					d.incoming_rate = get_rate_for_return(
+						self.doctype, self.name, d.item_code, self.return_against, item_row=d
+					)
+
 				# For internal transfers use incoming rate as the valuation rate
 				if self.is_internal_transfer():
 					if self.doctype == "Delivery Note" or self.get("update_stock"):